JP2022049266A - Light source device and projector - Google Patents

Abstract

To provide a light source device and a projector that can emit a plurality of rays of color light whose polarizations are aligned.SOLUTION: A light source device 2 comprises: a first light source unit 213 that emits first light; a second light source unit 214 that emits second light; a first polarized light separation element 22 that transmits first light BLp and second light R polarized in a first polarization direction and reflects first light BLs polarized in a second polarization direction; a second polarized light separation element 23 that reflects the first light polarized in the first polarization direction; a first diffusion element 26 that diffuses the first light incident from the first polarized light separation element; a wavelength conversion element 28 that converts the wavelength of the first light and emits third light GL; and a second diffusion element 36 that diffuses the second light from the second polarized light separation element. The second polarized light separation element transmits third light polarized in the first polarization direction and reflects third light polarized in the second polarization direction. The first polarized light separation element transmits the first light emitted from the first diffusion element and reflects the third light polarized in the second polarization direction. The second polarized light separation element reflects the second light emitted from the second diffusion element.SELECTED DRAWING: Figure 3

Description

The present invention relates to a light source device and a projector.

A projector that modulates the light emitted from a light source to generate image light based on image information and projects the generated image light is known. Patent Document 1 below discloses a projection type color image display device including a light source, a plurality of dichroic mirrors, a liquid crystal display element having a microlens array, and a projection lens. The projection type color image display device separates white light emitted from a light source into a plurality of color lights of different colors, and causes each of the separated plurality of color lights to be incident on different sub-pixels in one liquid crystal display element. Color display by.

In the above projection type color image display device, the red reflection dichroic mirror, the green reflection dichroic mirror, and the blue reflection dichroic mirror are arranged in a non-parallel state along the incident optical axis of the white light emitted from the light source. ing. The white light emitted from the light source is separated into red light, green light, and blue light having different traveling directions by passing through the above-mentioned dichroic mirror. The red light, green light, and blue light are spatially separated by a microlens provided on the incident side of the light modulation element, and are connected to the red subpixel, green subpixel, and blue subpixel of the light modulation element. Each is incident.

Japanese Unexamined Patent Publication No. 4-60538

In the projection type color image display device of Patent Document 1, a lamp light source such as a halogen lamp or a xenon lamp is adopted as a white light source, and a liquid crystal display element is adopted as a light modulation element. The light emitted from the lamp light source is unpolarized, but when a liquid crystal display element is used as the light modulation element, the light incident on the liquid crystal display element needs to be linearly polarized light having a specific polarization direction. On the other hand, as a means for uniformly illuminating the liquid crystal display element, a pair of multi-lens arrays that divide the incident light into a plurality of partial luminous fluxes between the white light source and the liquid crystal display element, and the polarization direction of the plurality of partial luminous fluxes. It is conceivable to provide a polarization conversion element for aligning the above. In this case, the plurality of polarization separation layers and the plurality of reflection layers alternately arranged along the direction intersecting the incident direction of the light, the optical path of the light transmitted through the polarization separation layer, or the light reflected by the reflection layer. A polarization conversion element including a retardation layer provided in any of the optical paths of the above is often used.

However, when the above-mentioned projection type color image display device is miniaturized in response to the recent demand for miniaturization, it is difficult to manufacture a polarization conversion element having a narrow pitch between the polarization separation layer and the reflection layer. Therefore, it is difficult to miniaturize the light source device provided with this kind of polarization conversion element, and by extension, to miniaturize the projector provided with the light source device. From such a problem, it is required to provide a light source device capable of emitting a plurality of colored lights having the same polarization direction without using a polarization conversion element having a narrow pitch.

In order to solve the above problems, according to one aspect of the present invention, light having a first wavelength band and polarized in the first polarization direction and polarized light in a second polarization direction different from the first polarization direction. A light source unit that emits a first light including the light to be emitted and a second light having a second wavelength band different from the first wavelength band, and the light incident from the light source unit along the first direction. The first light polarized in the first polarization direction is transmitted in the first direction, and the first light polarized in the second polarization direction is reflected in the second direction intersecting the first direction, and the light source unit. A first polarization separation element that transmits the second light incident along the first direction from the first direction and the first polarization separation element arranged in the first direction with respect to the first polarization separation element. The first light polarized in the first polarization direction incident from the polarization separation element along the first direction is reflected in the second direction and incident from the first polarization separation element along the first direction. A second polarization separation element that transmits the second light in the first direction and a second polarization separation element that is arranged in the second direction with respect to the first polarization separation element and is arranged in the second direction from the first polarization separation element. For the first diffusion element and the second polarization separation element, which diffuse the first light incident along the line and emit the diffused first light in a third direction opposite to the second direction. The first light that is arranged in the second direction and is incident along the second direction from the second polarization separation element is wavelength-converted, and is different from the first wavelength band and the second wavelength band. A wavelength conversion element that emits a third light having three wavelength bands in the third direction and a wavelength conversion element that is arranged in the first direction with respect to the second polarization separation element and is arranged in the first direction from the second polarization separation element. The second polarization separation is provided with a second diffusion element that diffuses the second light incident along the same direction and emits the diffused second light in a fourth direction opposite to the first direction. The element receives the third light from the wavelength conversion element along the third direction, transmits the third light polarized in the first polarization direction in the third direction, and transmits the third light in the second polarization direction. The third light to be polarized is reflected in the fourth direction, and the first polarization separation element transmits the first light emitted from the first diffusion element along the third direction in the third direction. Then, the third light polarized in the second polarization direction incident from the second polarization separation element along the fourth direction is reflected in the third direction, and the second polarization separation element is the second polarization separation element. 2 A light source that reflects the second light emitted from the diffusing element along the fourth direction in the third direction. Equipment is provided.

According to one aspect of the present invention, the first light having a first wavelength band and including light polarized in the first polarization direction and light polarized in a second polarization direction different from the first polarization direction. , A light source unit that emits a second light having a second wavelength band different from the first wavelength band, and the first light incident along the first direction from the light source unit in the first direction. For the first polarization separation element and the first polarization separation element that transmit and reflect the second light incident from the light source unit along the first direction in the second direction intersecting the first direction. The first light that is arranged in the first direction and is polarized in the first polarization direction incident from the first polarization separation element along the first direction is transmitted in the first direction, and the second light is transmitted. A second polarization separation element that reflects the first light polarized in the polarization direction in the second direction, and a second polarization separation element that is arranged in the second direction with respect to the second polarization separation element. The first light polarized in the second polarization direction incident along the two directions is wavelength-converted, and the third light having a third wavelength band different from the first wavelength band and the second wavelength band is obtained. A wavelength conversion element that emits light in a third direction opposite to the second direction and a wavelength conversion element that is arranged in the first direction with respect to the second polarization separation element and along the first direction from the second polarization separation element. With respect to the first diffusion element and the first polarization separation element, which diffuses the incident first light and emits the diffused first light in a fourth direction opposite to the first direction. A second diffusion that diffuses the second light that is arranged in the second direction and is incident along the second direction from the first polarization separation element, and emits the diffused second light in the third direction. The second polarization separation element comprises an element, wherein the third light is incident from the wavelength conversion element along the third direction, and the third light is polarized in the first polarization direction. The third light transmitted in the direction and polarized in the second polarization direction is reflected in the fourth direction, and the first polarization separating element is emitted from the second diffusion element along the third direction. The second light is transmitted in the third direction, and the third light incident from the second polarization separating element along the fourth direction and polarized in the second polarization direction is reflected in the third direction. The second polarization separation element is provided with a light source device that reflects the first light emitted from the first diffusion element along the fourth direction in the third direction.

According to one aspect of the present invention, the light source device of one aspect of the present invention, the optical modulator that modulates the light from the light source device according to the image information, and the light modulated by the optical modulator. A projector comprising a projection optical device for projecting is provided.

It is a schematic block diagram of the projector of 1st Embodiment. It is a perspective view of the light source apparatus of 1st Embodiment. It is a top view of the light source device seen from the + Y direction. It is a figure which shows the main part structure of a light source. It is a perspective view which shows the structure of a mirror unit. It is a side sectional view which looked at the mirror unit from the −X direction to the + X direction. -It is a side view of the light source device seen from the X direction. It is a side view of the light source device seen from the + X direction. It is a schematic diagram which shows the incident position of each color light on a multi-lens. It is an enlarged view of the optical modulation apparatus. It is a top view of the main part of the light source apparatus of the 2nd Embodiment seen from the + Y direction. It is a side view of the light source apparatus of 2nd Embodiment seen from the X direction. It is a side view of the light source apparatus of 2nd Embodiment seen from the + X direction. It is a schematic diagram which shows the incident position of each color light on the multi-lens of 2nd Embodiment.

[First Embodiment]
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 10.
FIG. 1 is a schematic configuration diagram of the projector 1 of the present embodiment.
In each of the following drawings, in order to make each component easy to see, the scale of the dimensions may be different depending on the component.

The projector 1 according to the present embodiment modulates the light emitted from the light source device 2 to form an image corresponding to the image information, and enlarges and projects the formed image on a projected surface such as a screen. In other words, the projector 1 modulates the light emitted from the light source device 2 by one optical modulation device 6 including one liquid crystal panel 61 to form an image, and projects the formed image. The projector 1 is a so-called single-panel projector.

As shown in FIG. 1, the projector 1 includes a light source device 2, a homogenizing device 4, a field lens 5, an optical modulation device 6, and a projection optical device 7. The light source device 2, the homogenizing device 4, the field lens 5, the optical modulation device 6, and the projection optical device 7 are arranged at predetermined positions along the illumination optical axis Ax. The illumination optical axis Ax is defined as an axis along the traveling direction of the main light ray of the light L emitted from the light source device 2.

The configuration of the light source device 2 and the homogenization device 4 will be described in detail later.
The field lens 5 is arranged between the homogenizing device 4 and the optical modulation device 6. The field lens 5 parallelizes the light L emitted from the homogenizing device 4 and guides the light L to the light modulation device 6.

The projection optical device 7 projects the light modulated by the light modulation device 6, that is, the light forming an image onto a projected surface (not shown) such as a screen. The projection optical device 7 has one or more projection lenses.

In the following description, the axis parallel to the traveling direction of the light emitted from the light source device 2 along the illumination optical axis Ax is defined as the Z axis, and the traveling direction of the light is defined as the + Z direction. Further, the two axes orthogonal to the Z axis and orthogonal to each other are defined as the X axis and the Y axis. Of the directions along these axes, the upper vertical direction in the space where the projector 1 is installed is defined as the + Y direction. Further, the right side in the horizontal direction when the object to which light is incident is seen along the + Z direction is defined as the + X direction so that the + Y direction faces upward in the vertical direction. Although not shown, the direction opposite to the + X direction is defined as the −X direction, the opposite direction to the + Y direction is defined as the −Y direction, and the opposite direction to the + Z direction is defined as the −Z direction.
The + X direction of the present embodiment corresponds to the first direction of the claims, and the −Z direction of the present embodiment corresponds to the second direction of the claims. Further, the + Z direction of the present embodiment corresponds to the third direction of the claims, and the −X direction of the present embodiment corresponds to the fourth direction of the claims.

[Structure of light source device]
FIG. 2 is a perspective view of the light source device 2 of the present embodiment. FIG. 3 is a plan view of the light source device 2 as seen from the + Y direction.
As shown in FIGS. 2 and 3, the light source device 2 emits light L that illuminates the light modulation device 6 in a direction parallel to the illumination optical axis Ax, that is, in the + Z direction. The light L emitted by the light source device 2 is linearly polarized light having the same polarization direction, and includes a plurality of spatially separated colored lights. In the present embodiment, the light L emitted by the light source device 2 is composed of four light fluxes each of which is composed of P-polarized light. The four luminous fluxes are green light GLp1, blue light BLp, red light RLp1 and green light GLp.

The light source device 2 includes a light source unit 21, a first optical member 22, a second optical member 23, a first retardation element 24, a first condensing element 25, a first diffuser 26, and a second position. The phase difference element 34, the second light source element 27, the second diffuser 36, the first color separation element 29, the second color separation element 33, the fourth phase difference element 30, and the fifth phase difference element 32. A third light source element 35, a wavelength conversion element 28, and a mirror unit 40.

The P-polarized component of the present embodiment corresponds to the light polarized in the first polarization direction in the range of the patent claim, and the S-polarized component corresponds to the light polarized in the second polarization direction in the range of the patent claim. Further, as will be described later, the orientation of the film that separates the polarization component or the color light is different between the first optical member 22 and the second optical member 23 and the first color separation element 29 and the second color separation element 33. .. Therefore, the notation of the P polarization component and the S polarization component is expressed in the polarization direction with respect to the first optical member 22 and the second optical member 23, and is opposite in the polarization direction with respect to the first color separation element 29 and the second color separation element 33. become. That is, the P polarization component for the first optical member 22 and the second optical member 23 is the S polarization component for the first color separation element 29 and the second color separation element 33, and the first optical member 22 and the second optical member 23. The S-polarizing component for the first color separating element 29 and the second color separating element 33 is a P-polarizing component for the second color separating element 33. However, in order not to confuse the explanation, in the following, the P polarization component and the S polarization component will be referred to as the polarization directions with respect to the first optical member 22 and the second optical member 23.

[Structure of light source unit]
The light source unit 21 includes a light source 211 and a mobile phase difference device 219. The light source 211 emits blue light BL and red light RLp incident on the first optical member 22 along the + X direction.
The light source 211 includes a substrate 212, a plurality of blue light emitting elements 213, a plurality of red light emitting elements 214, a frame 215, and a cover glass 216. The substrate 212 is made of a metal having high thermal conductivity, such as copper. The light source 211 of the present embodiment has a multi-emitter package structure in which a blue light emitting element 213 and a red light emitting element 214 are mounted on a substrate 212.

Each blue light emitting element 213 is composed of a semiconductor laser that emits a blue light ray B. The blue ray B is a laser beam having a blue wavelength band of, for example, 440 to 480 nm, and having a peak wavelength in the range of, for example, 450 to 460 nm. In the present embodiment, the blue ray B having a blue wavelength band corresponds to the light in the first wavelength band in the claims. The blue light emitting element 213 of the present embodiment corresponds to the first light emitting element within the scope of the claims.

Each red light emitting element 214 is composed of a semiconductor laser that emits a red light ray R. The red ray R is, for example, a laser beam having a red wavelength band of 585 to 720 nm and having a peak wavelength in the range of, for example, 635 nm ± 20 nm. In the present embodiment, the red ray R having a red wavelength band corresponds to the light in the second wavelength band in the claims. The red light emitting element 214 of the present embodiment corresponds to the second light emitting element within the scope of the claims.

In the case of the present embodiment, the plurality of blue light emitting elements 213 and the plurality of red light emitting elements 214 are arranged along the Y axis. The plurality of blue light emitting elements 213 and the plurality of red light emitting elements 214 are each supported by the substrate 212 via the support member 218. The number of blue light emitting elements 213 and red light emitting elements 214 is not limited. Further, in the light source 211 of the present embodiment, the case where the light emitting element rows of the blue light emitting element 213 and the red light emitting element 214 are provided one by one is taken as an example, but the light emitting element rows of the blue light emitting element 213 and the red light emitting element 214 are provided. A plurality of rows may be provided along the Z direction. The number of light emitting element rows of the blue light emitting element 213 and the red light emitting element 214 may be the same or different.

The frame 215 attaches the cover glass 216 to the substrate 212. A plurality of collimator lenses 217 are integrally provided on the cover glass 216. The collimator lens 217 is composed of a convex lens. The collimator lens 217 is emitted from the corresponding blue light emitting element 213 or the red light emitting element 214 to parallelize the light rays. The collimator lens 217 may be separate from the cover glass 216.

FIG. 4 is a diagram showing a main configuration of a blue light emitting element 213 and a red light emitting element 214 mounted in the light source 211. In FIG. 4, in order to make the figure easier to see, the frame 215 and the cover glass 216 constituting the light source 211 are not shown.

As shown in FIG. 4, the light emitting surface 213a of the blue light emitting element 213 has a substantially rectangular planar shape.
The blue light emitting elements 213 are arranged in the Y-axis direction so that the longitudinal directions of the respective light emitting surfaces 213a coincide with the Y-axis direction in the light source 211. In this case, the beam shape of the blue light ray B emitted from the blue light emitting element 213 is an elliptical shape having a long axis in the lateral direction (Z-axis direction) of the light emitting surface 213a. The blue light ray B is linearly polarized light having a polarization direction parallel to the longitudinal direction (Y-axis direction) of the light emitting surface 213a. That is, the blue light emitting element 213 of the present embodiment is arranged in the light source 211 so as to emit S polarized light as the blue light ray B.

Further, the light emitting surface 214a of the red light emitting element 214 has a substantially rectangular planar shape like the blue light emitting element 213.
The red light emitting elements 214 are arranged in the Y-axis direction so that the longitudinal directions of the respective light emitting surfaces 214a coincide with the Y-axis direction in the light source 211. In this case, the beam shape of the red light ray R emitted from the red light emitting element 214 is an elliptical shape having a long axis in the lateral direction (Z-axis direction) of the light emitting surface 214a. Unlike the blue light ray B, the red light ray R is linearly polarized light having a polarization direction parallel to the lateral direction of the light emitting surface 214a. That is, the red light emitting element 214 of the present embodiment is arranged in the light source 211 so as to emit P-polarized light as the red light ray R.

By having the above configuration, the light source 211 of the present embodiment has blue light BLs composed of blue light rays B having an S-polarized component emitted from a plurality of blue light emitting elements 213 and P emitted from a plurality of red light emitting elements 214. It is possible to emit red light RLp, which is composed of a red ray R as a polarizing component.

As shown in FIG. 4, the mobile phase difference device 219 includes a third phase difference element 2191 and a mobile device 2192. The third phase difference element 2191 can be inserted into the optical path of blue light BLs emitted from the light source 211 along the Y axis. The moving device 2192 is composed of an actuator or the like, and moves the third phase difference element 2191 along the Y-axis direction.

The third retardation element 2191 is composed of a 1/2 wave plate or a 1/4 wave plate for the blue wavelength band. A part of the blue light BLs of the S polarization component incident on the third retardation element 2191 is converted into the blue light BLp of the P polarization component by the third retardation element 2191. Therefore, the blue light transmitted through the third retardation element 2191 is a mixture of the blue light BLs of the S polarization component and the blue light BLp of the P polarization component in a predetermined ratio. That is, the third phase difference element 2191 is incident with the blue light BLs emitted from the light source 211, and emits blue light including the blue light BLs of the S polarization component and the blue light BLp of the P polarization component.

By adjusting the amount of movement of the third phase difference element 2191 in the Y direction by the moving device 2192, the amount of light of the blue light BLs of the S polarization component and the P polarization component contained in the light transmitted through the third phase difference element 2191. The ratio of the blue light BLp to the amount of light is adjusted. If it is not necessary to adjust the ratio between the amount of blue light BLs and the amount of blue light BLp, the moving device 2192 for moving the third phase difference element 2191 may not be provided. In that case, the position of the third phase difference element 2191 may be fixed so that the ratio of the light amount of the blue light BLs and the light amount of the blue light BLp becomes the ratio of the preset light amount.

In this way, the light source unit 21 of the present embodiment includes the blue light BL having a blue wavelength band including the blue light BLs of the S polarization component and the blue light BLp of the P polarization component, and the red light RLp of the P polarization component. , Is ejected. To eject. In the present embodiment, the blue light BL having a blue wavelength band corresponds to the first light having a first wavelength band in the claims. Further, the blue light BLp of the P polarization component corresponds to the light polarized in the first polarization direction in the range of the patent claim, and the blue light BLs of the S polarization component corresponds to the light polarized in the second polarization direction in the range of the patent claim. do. Further, the red light RLp having a red wavelength band corresponds to the second light having a second wavelength band in the claims.

In the light source 211 of the present embodiment, each blue light emitting element 213 is arranged so as to emit blue light BLs of the S polarization component, but the light amount ratio of S polarization and P polarization is determined by the mobile phase difference device 219. Since it can be set arbitrarily, each blue light emitting element 213 may be arranged so as to emit the blue light of the P polarization component. That is, each blue light emitting element 213 may be arranged so as to be rotated by 90 ° about the emission optical axis. Further, the blue light emitting element 213 or the red light emitting element 214 may be composed of another solid-state light source such as an LED (Light Emitting Diode) instead of the semiconductor laser.

[Structure of the first optical member]
The blue light BL including the blue light BLs of the S-polarizing component and the blue light BLp of the P-polarizing component and the red light RLp of the P-polarizing component emitted from the light source 211 are emitted from the first optical member 22 in the + X direction. It is incident along. The first optical member 22 is composed of a plate-type polarization separating element. The first optical member 22 of the present embodiment corresponds to the first polarization separating element within the scope of claims.

The first optical member 22 includes a first transparent substrate 220, a first optical layer 221 and a second optical layer 222. The first transparent substrate 220 has a first surface 220a and a second surface 220b that face each other in opposite directions. The first transparent substrate 220 is made of a general optical glass plate.

The first transparent substrate 220 is arranged so as to be inclined by 45 ° with respect to the X-axis and the Z-axis. In other words, the first transparent substrate 220 is tilted by 45 ° with respect to the XY plane and the YZ plane.

The first transparent substrate 220 is arranged so that the first surface 220a faces the light source unit 21 side. The first optical layer 221 is formed on the first surface 220a of the first transparent substrate 220. Therefore, the first optical layer 221 is arranged to face the light source unit 21 and is inclined by 45 ° with respect to the XY plane and the YZ plane.

The first optical layer 221 has a polarization separation characteristic of transmitting the P polarization component and reflecting the S polarization component with respect to the blue light BL among the incident light. Therefore, among the blue light BL incident along the + X direction, the first optical layer 221 transmits the blue light BLp of the P polarization component along the + X direction, and transmits the blue light BLs of the S polarization component to −Z. Reflect in the direction. Further, the first optical layer 221 has a property of transmitting light in the red wavelength band. Therefore, the first optical layer 221 transmits the red light RLp of the P polarization component incident along the + X direction along the + X direction. The first optical layer 221 is composed of, for example, a dielectric multilayer film.

The second optical layer 222 is formed on the second surface 220b of the first transparent substrate 220. That is, the second optical layer 222 is arranged in the + X direction with respect to the first optical layer 221. The second optical layer 222 has an optical property of transmitting the light of the P polarization component to the incident light regardless of the wavelength band and reflecting the light of the S polarization component. Therefore, the blue light BLp of the P polarization component and the red light RLp of the P polarization component transmitted through the first optical layer 221 pass through the first transparent substrate 220 and are incident on the second optical layer 222. The second optical layer 222 transmits the blue light BLp of the P-polarizing component and the red light RLp of the P-polarizing component incident along the + X direction from the first optical layer 221 in the + X direction. In the present embodiment, the second optical layer 222 is composed of, for example, a dielectric multilayer film. As described above, the second optical layer 222 of the present embodiment may have a polarization separation function of transmitting the light of the P polarization component and reflecting the S polarization component regardless of the wavelength band of the incident light. , The membrane design becomes easy.

According to the first optical member 22 having the above configuration, the blue light BLp of the P-polarized component incident along the + X direction from the light source unit 21 is transmitted in the + X direction, and the blue light BLs of the S-polarized component is transmitted in the −Z direction. It is possible to transmit the red light RLp of the P-polarized component which is reflected and is incident along the + X direction from the light source unit 21 in the + X direction.

Since the first optical member 22 of the present embodiment is a plate-type polarization separating element, the function of the first optical layer 221 formed on the first surface 220a of the first transparent substrate 220 and the second of the first transparent substrate 220. It can be designed separately from the function of the second optical layer 222 formed on the surface 220b. Therefore, the film design of the first optical layer 221 and the second optical layer 222 becomes relatively easy.

[Structure of the second optical member]
The second optical member 23 is arranged in the + X direction with respect to the first optical member 22. That is, the second optical member 23 is arranged in the + X direction with respect to the second optical layer 222 of the first optical member 22. Blue light BLp, which is a P-polarized component transmitted through the first optical member 22, is incident on the second optical member 23. Like the first optical member 22, the second optical member 23 is composed of a plate-type polarization separating element. The second optical member 23 of the present embodiment corresponds to the second polarization separating element within the scope of claims.

The second optical member 23 has a second transparent substrate 230, a third optical layer 231 and a fourth optical layer 232. The second transparent substrate 230 has a third surface 230a and a fourth surface 230b that face each other in opposite directions. The second transparent substrate 230 is made of a general optical glass plate.
The second transparent substrate 230 is arranged so as to be inclined by 45 ° with respect to the X-axis and the Z-axis. In other words, the second transparent substrate 230 is tilted by 45 ° with respect to the XY plane and the YZ plane.

The second transparent substrate 230 is arranged so that the third surface 230a faces the first optical member 22 side. That is, the third surface 230a of the second transparent substrate 230 and the second surface 220b of the first transparent substrate 220 face each other. The third optical layer 231 is formed on the third surface 230a of the second transparent substrate 230. Therefore, the third optical layer 231 is arranged to face the second optical layer 222 and is inclined by 45 ° with respect to the XY plane and the YZ plane.

The third optical layer 231 has a characteristic of reflecting the P-polarized component with respect to the light in the blue wavelength band among the incident light. Therefore, the third optical layer 231 reflects the blue light BLp of the P polarization component incident along the + X direction in the −Z direction. Further, the third optical layer 231 has an optical property of transmitting at least the light of the P polarization component among the light of the red wavelength band. Therefore, the third optical layer 231 transmits the red light RLp of the P polarization component incident in the + X direction from the first optical member 22 in the + X direction. Further, the third optical layer 231 has a polarization separation characteristic of transmitting the P polarization component to light in the green wavelength band and reflecting the S polarization component. The third optical layer 231 is composed of, for example, a dielectric multilayer film.

The fourth optical layer 232 is formed on the fourth surface 230b of the second transparent substrate 230. That is, the fourth optical layer 232 is arranged in the + X direction with respect to the third optical layer 231. The fourth optical layer 232 has an optical property of transmitting light of at least the P polarization component of the light in the green wavelength band. Further, the fourth optical layer 232 has a polarization separation characteristic of transmitting a P-polarizing component to light in the red wavelength band and reflecting the S-polarizing component. The fourth optical layer 232 is composed of, for example, a dielectric multilayer film. When a film having optical characteristics of reflecting the light of the S-polarizing component of the red wavelength band light is used as the third optical layer 231, the fourth optical layer 232 can be formed of a simple AR-coated film.

According to the second optical member 23 having the above configuration, the blue light BLp of the P polarization component incident from the first optical member 22 along the + X direction is reflected in the −Z direction and is reflected from the first optical member 22 in the + X direction. It is possible to transmit the red light RLs of the S polarization component incident along the line in the + X direction.

Since the second optical member 23 of the present embodiment is a plate-type polarization separating element, the function of the third optical layer 231 formed on the third surface 230a of the second transparent substrate 230 and the fourth of the second transparent substrate 230. It can be designed separately from the function of the fourth optical layer 232 formed on the surface 230b. Therefore, the film design of the third optical layer 231 and the fourth optical layer 232 becomes relatively easy.

[Structure of first phase difference element]
The first retardation element 24 is arranged in the −Z direction with respect to the first optical member 22. That is, the first retardation element 24 is arranged between the first optical member 22 and the first diffusion device 26 on the Z axis. Blue light BLs of the S polarization component reflected in the −Z direction by the first optical layer 221 of the first optical member 22 are incident on the first retardation element 24. The first retardation element 24 is composed of a quarter wave plate with respect to the blue wavelength band of the incident blue light BLs. The blue light BLs of the S polarization component reflected by the first optical member 22 are converted into, for example, clockwise circularly polarized blue light BLc1 by the first retardation element 24, and then directed toward the first condensing element 25. Be ejected. That is, the first retardation element 24 converts the polarization state of the incident blue light BLs.

[Structure of the first condensing element]
The first light collecting element 25 is arranged in the −Z direction with respect to the first retardation element 24. That is, the first light collecting element 25 is arranged between the first retardation element 24 and the first diffusion device 26 on the Z axis. The first condensing element 25 focuses the blue light BLc1 incident from the first retardation element 24 on the diffusing plate 261 of the first diffusing device 26. Further, the first condensing element 25 parallelizes the blue light BLc2, which will be described later, incident from the first diffusing device 26. In the example of FIG. 3, the first condensing element 25 is composed of the first lens 251 and the second lens 252, but the number of lenses constituting the first condensing element 25 is not limited.

[Structure of the first diffuser]
The first diffusing device 26 is arranged in the −Z direction with respect to the first condensing element 25. That is, the first diffusion device 26 is arranged in the −Z direction with respect to the first optical member 22. The first diffusing device 26 diffuses the blue light BLc1 incident in the −Z direction from the first condensing element 25 so as to have a diffusion angle equivalent to that of the green light GL emitted from the wavelength conversion element 28 described later. While reflecting in the + Z direction. The first diffusion device 26 includes a diffusion plate 261 and a rotation device 262. The diffuser plate 261 preferably has a reflection characteristic as close as possible to Lambert scattering, and reflects the incident blue light BLc1 at a wide angle. The rotating device 262 is composed of a motor or the like, and rotates the diffusion plate 261 around a rotation axis R1 parallel to the + Z direction.
The diffusion plate 261 of the present embodiment corresponds to the first diffusion element within the scope of claims.

The blue light BLc1 incident on the diffuser plate 261 is reflected by the diffuser plate 261 and converted into blue light BLc2 which is circularly polarized light in the opposite direction of rotation. That is, the clockwise circularly polarized blue light BLc1 is converted into the counterclockwise circularly polarized blue light BLc2 by the diffuser plate 261. The blue light BLc2 emitted from the first diffusing device 26 passes through the first condensing element 25 in the + Z direction, and then re-enters the first retardation element 24. At this time, the blue light BLc2 incident on the first phase difference element 24 from the first light collecting element 25 is converted into the blue light BLp of the P polarization component by the first phase difference element 24. The converted blue light BLp is incident on the first optical member 22. At this time, the first optical layer 221 transmits the incident blue light BLp emitted from the diffuser plate 261 along the + Z direction in the + Z direction. The second optical layer 222 transmits the blue light BLp emitted from the first optical layer 221 along the + Z direction and transmitted through the first transparent substrate 220 and incident in the + Z direction. The blue light BLp converted in this way is emitted from the first optical member 22 in the + Z direction.

[Structure of second phase difference element]
The second phase difference element 34 is arranged in the + X direction with respect to the second optical member 23. That is, the second phase difference element 34 is arranged between the second optical member 23 and the second diffusion device 36 on the X axis. The red light RLp of the P polarization component incident along the + X direction is incident on the second phase difference element 34 from the second optical member 23. The second retardation element 34 is composed of a quarter wave plate with respect to the red wavelength band of the incident red light RLp. The red light RLp of the P-polarized component transmitted through the second optical member 23 is converted into, for example, clockwise circularly polarized red light RLc1 by the second retardation element 34, and then emitted toward the second condensing element 27. Will be done. That is, the second phase difference element 34 converts the polarization state of the incident red light RLp.

[Structure of the second light collecting element]
The second light collecting element 27 is arranged in the + X direction with respect to the second retardation element 34. That is, the second light collecting element 27 is arranged between the second phase difference element 34 and the second diffusing device 36 on the X axis. The second condensing element 27 focuses the red light RLc1 incident from the second retardation element 34 on the diffusing plate 361 of the second diffusing device 36. Further, the second condensing element 27 parallelizes the red light RLc2, which will be described later, incident from the second diffusing device 36. In the example of FIG. 3, the second condensing element 27 is composed of the first lens 271 and the second lens 272, but the number of lenses constituting the second condensing element 27 is not limited.

[Structure of the second diffuser]
The second diffusing device 36 is arranged in the + X direction with respect to the second light collecting element 27. That is, the second diffusion device 36 is arranged in the + X direction with respect to the second optical member 23. The second diffusing device 36 diffuses the red light RLp incident in the + X direction from the second condensing element 27 so as to have a diffusion angle equivalent to that of the green light GL emitted from the wavelength conversion element 28 described later. It reflects in the + Z direction. The second diffusion device 36 includes a diffusion plate 361 and a rotation device 362. The diffuser plate 361 preferably has a reflection characteristic as close as possible to Lambert scattering, and reflects the incident red light RLc1 at a wide angle. The rotation device 362 is composed of a motor or the like, and rotates the diffusion plate 361 around a rotation axis R2 parallel to the X axis.
The diffusion plate 361 of the present embodiment corresponds to the second diffusion element within the scope of claims.

The red light RLc1 incident on the diffuser plate 361 is reflected by the diffuser plate 361 and converted into red light RLc2 which is circularly polarized light in the opposite direction of rotation. That is, the counterclockwise circularly polarized red light RLc1 is converted into the clockwise circularly polarized red light RLc2 by the diffuser plate 361. The red light RLc2 emitted from the second diffusing device 36 passes through the second condensing element 27 in the −X direction, and then re-enters the second retardation element 34. At this time, the red light RLc2 incident on the second phase difference element 34 from the second light collecting element 27 is converted into red light RLs of the S polarization component by the second phase difference element 34. The converted red light RLs are incident on the second optical member 23. At this time, the fourth optical layer 232 reflects the incident red light RLs emitted from the diffuser plate 361 along the −X direction in the + Z direction. The red light RLs converted in this way are emitted from the second optical member 23 in the + Z direction.

[Structure of the third condensing element]
The third light collecting element 35 is arranged in the −Z direction with respect to the second optical member 23. That is, the third light collecting element 35 is arranged between the second optical member 23 and the wavelength conversion element 28 on the Z axis. The third condensing element 35 focuses the blue light BLp reflected by the second optical member 23 on the wavelength conversion element 28. Further, the third condensing element 35 parallelizes the green light GL, which will be described later, emitted from the wavelength conversion element 28, and emits the green light GL toward the second optical member 23. In the example of FIG. 3, the third condensing element 35 is composed of the first lens 351 and the second lens 352, but the number of lenses constituting the third condensing element 35 is not limited.

[Structure of wavelength conversion element]
The wavelength conversion element 28 is arranged in the −Z direction with respect to the third light collecting element 35. That is, the wavelength conversion element 28 is arranged in the −Z direction with respect to the second optical member 23. The wavelength conversion element 28 is a reflection type wavelength conversion element that is excited by the incident light and emits light having a wavelength different from the wavelength of the incident light in the direction opposite to the incident direction of the light. .. In other words, the wavelength conversion element 28 converts the incident light into wavelength, and emits the wavelength-converted light in the direction opposite to the incident direction of the light.

In the present embodiment, the wavelength conversion element 28 contains a green phosphor that is excited by blue light and emits green light. Specifically, the wavelength conversion element 28 is, for example, Lu ₃ Al ₅ O ₁₂ : Ce ³⁺ system phosphor, Y ₃ O ₄ : Eu ²⁺ system phosphor, (Ba, Sr) ₂ SiO ₄ : Eu ²⁺ system phosphor, Ba. ₃ Si ₆ O ₁₂ N ₂ : Fluorescent material such as Eu ²⁺ fluorescent material, (Si, Al) ₆ (O, N) ₈ : Eu ²⁺ fluorescent material is contained.

The wavelength conversion element 28 transmits fluorescence having a green wavelength band longer than the blue wavelength band of the blue light BLp incident along the −Z direction from the second optical member 23, that is, unpolarized green light GL in the + Z direction. Eject. The green light GL has a wavelength band of, for example, 500 to 570 nm, and is a green light in which an S-polarized component and a P-polarized component are mixed.
The fluorescence having the green wavelength band of the present embodiment, that is, the unpolarized green light GL corresponds to the third light having the third wavelength band in the claims.

The green light GL emitted from the wavelength conversion element 28 passes through the third condensing element 35 along the + Z direction and is substantially paralleled, and then incidents on the second optical member 23. The wavelength conversion element 28 of the present embodiment is a fixed wavelength conversion element, but instead of this configuration, a rotary wavelength having a rotating device for rotating the wavelength conversion element 28 around a rotation axis parallel to the Z axis. A conversion element may be used. In this case, the temperature rise of the wavelength conversion element 28 is suppressed, and the wavelength conversion efficiency can be improved.

As described above, the third optical layer 231 of the second optical member 23 has a polarization separation characteristic of reflecting S polarization with respect to light in the green wavelength band and transmitting P polarization. Therefore, of the unpolarized green light GL incident on the third optical layer 231, the green light GLs of the S-polarized component are reflected by the third optical layer 231 in the −X direction and are reflected by the third optical layer 231 in the −X direction to the first optical member 22. 2 It is incident on the optical layer 222. As described above, the second optical layer 222 has an optical property of reflecting S-polarized light with respect to incident light regardless of the wavelength band. Therefore, the second optical layer 222 reflects the green light GLs of the S polarization component incident along the −X direction in the + Z direction.
As a result, the first optical member 22 can emit the green light GLs of the S polarization component among the green light GL emitted from the wavelength conversion element 28 in the + Z direction.

On the other hand, of the unpolarized green light GL incident on the third optical layer 231, the green light GLp of the P-polarized component passes through the third optical layer 231 in the + Z direction and is incident on the fourth optical layer 232. As described above, the fourth optical layer 232 transmits light of at least the P polarization component of the light in the green wavelength band. Therefore, the fourth optical layer 232 transmits the green light GLp of the P-polarized component incident along the + Z direction from the third optical layer 231 in the + Z direction.
As a result, the second optical member 23 can emit the green light GLp of the P polarization component in the + Z direction.
In the present embodiment, the green light GLp of the P polarization component corresponds to the third light polarized in the first polarization direction in the range of the patent claim, and the green light GLs of the S polarization component corresponds to the second polarization direction in the range of the patent claim. Corresponds to the third light to be polarized.

[Mirror unit configuration]
FIG. 5 is a perspective view showing the configuration of the mirror unit 40. FIG. 6 is a side sectional view of the mirror unit 40 viewed from the −X direction to the + X direction. FIG. 6 shows the green light GL emitted from the third light collecting element 35 and incident on the second optical member 23.

As shown in FIG. 5, the mirror unit 40 has a first mirror 141 and a second mirror 142. The mirror unit 40 of the present embodiment has a function as a support member for supporting the first transparent substrate 220 and the second transparent substrate 230.
The first mirror 141 is arranged in the + Y direction with respect to the first transparent substrate 220 and the second transparent substrate 230. The first mirror 141 has a light reflecting surface on the inner surface side facing at least the first transparent substrate 220 and the second transparent substrate 230. The second mirror 142 is arranged in the −Y direction with respect to the first transparent substrate 220 and the second transparent substrate 230. The second mirror 142 has a light reflecting surface at least on the inner surface side facing the first transparent substrate 220 and the second transparent substrate 230.
In the present embodiment, the + Y direction corresponds to the fifth direction of the claims, and the −Y direction corresponds to the sixth direction of the claims.

In the present embodiment, the green light GL emitted from the wavelength conversion element 28 is substantially parallelized by the third condensing element 35, but some of the components are incident on the second optical member 23 in a divergent state. Here, as the light source device of the comparative example, consider a configuration in which the mirror unit 40 is removed from the light source device 2 of the present embodiment.

Since the second optical member 23 is a plate-type polarization separating element, when the mirror unit 40 is not provided as in the light source device of the comparative example, a part of the green light GL emitted from the third condensing element 35 is the first. Since it spreads outward from the two optical members 23, it cannot enter the second optical member 23, and the light utilization efficiency of the green light GL may decrease.

On the other hand, since the light source device 2 of the present embodiment includes the mirror unit 40, as shown in FIG. 6, the green light GL spread in the Y direction is reflected by the first mirror 141 and the second mirror 142. It can be incorporated into the second optical member 23. Thereby, the light utilization efficiency of the green light GL can be improved.

Further, the blue light BLp emitted from the first condensing element 25 and spreading in the Y direction can also be efficiently taken into the first optical member 22 by being reflected by the first mirror 141 and the second mirror 142. This makes it possible to improve the light utilization efficiency of the blue light BLp. Further, the red light RLs emitted from the second light collecting element 27 and spread in the Y direction can also be efficiently taken into the second optical member 23 by being reflected by the first mirror 141 and the second mirror 142. This makes it possible to improve the light utilization efficiency of red light RLs. Further, the blue light BL and the red light RLp emitted from the light source unit 21 in the Y direction can be efficiently taken into the first optical member 22 by being reflected by the first mirror 141 and the second mirror 142. can. This makes it possible to improve the light utilization efficiency of the blue light BL and the red light RLp.

[Structure of first color separation element]
FIG. 7 is a side view of the light source device 2 as viewed from the −X direction. That is, FIG. 7 shows a state in which the first color separating element 29, the fourth retardation element 30, and the like are viewed from the −X direction. In FIG. 7, the first retardation element 24, the first condensing element 25, the first diffusion device 26, and the like are omitted in order to make the drawings easier to see.

As shown in FIG. 7, the first color separating element 29 is arranged in the + Z direction with respect to the first optical member 22. The first color separation element 29 has a dichroic prism 291 and a reflection prism 292. The dichroic prism 291 and the reflection prism 292 are arranged side by side along the Y axis. The first color separation element 29 separates the light emitted from the first optical member 22 in the + Z direction into blue light BLp and green light GLs.

Light including blue light BLp and green light GLs emitted from the first optical member 22 is incident on the dichroic prism 291. The dichroic prism 291 is composed of a prism-type color separation element formed in a substantially rectangular parallelepiped shape by combining two base materials having a substantially right-angled isosceles triangular column. A color separation layer 2911 is provided at the interface between the two substrates. The color separation layer 2911 is tilted by 45 ° with respect to the Y-axis and the Z-axis. In other words, the color separation layer 2911 is tilted by 45 ° with respect to the XY plane and the YZ plane.

The color separation layer 2911 functions as a dichroic mirror that reflects the blue light component of the incident light and transmits the color light having a wavelength band larger than the blue wavelength band, that is, the green light component. Therefore, of the light incident on the dichroic prism 291 from the first optical member 22, the green light GLs pass through the color separation layer 2911 in the + Z direction and are emitted to the outside of the dichroic prism 291.

On the other hand, of the light incident on the dichroic prism 291 from the first optical member 22, the blue light BLp is reflected in the −Y direction by the color separation layer 2911. In the case of the present embodiment, the blue light BLp is the light of the S polarization component with respect to the color separation layer 2911 of the dichroic prism 291 and the green light GLs is the light of the P polarization component with respect to the color separation layer 2911 of the dichroic prism 291. That is, the color separation layer 2911 of the present embodiment reflects the blue light BLp incident as the light of the S polarization component, and transmits the green light GLs incident as the light of the P polarization component. In general, the light of the S-polarized component is easily reflected, and the light of the P-polarized component is easily transmitted. Since the color separation layer 2911 of the present embodiment may be designed so as to transmit P polarization and reflect S polarization as described above, the film design of the color separation layer 2911 becomes easy.

Instead of the dichroic prism 291, a dichroic mirror having a color separation layer 2911 may be adopted. Further, the first color separation element 29 may have a configuration having a polarization separation element having a polarization separation layer and a reflection prism 292. Instead of the dichroic prism 291, for example, a polarization separation element that transmits incident blue light BLp in the + Z direction and reflects green light GLs toward the reflection prism 292 in the −Y direction is adopted for the first color separation element 29. However, the blue light BLp and the green light GLs can be separated in the same manner as the first color separating element 29 having the dichroic prism 291.

The reflection prism 292 is arranged in the −Y direction with respect to the dichroic prism 291. Blue light BLp reflected by the color separation layer 2911 is incident on the reflection prism 292. The reflection prism 292 is a prism-type reflection element formed in a substantially rectangular parallelepiped shape by combining two base materials having a substantially right-angled isosceles triangular columnar shape. A reflective layer 2921 is provided at the interface between the two substrates. The reflective layer 2921 is inclined by 45 ° with respect to the + Y direction and the + Z direction. In other words, the reflective layer 2921 is tilted 45 ° with respect to the XY and YZ planes. That is, the reflective layer 2921 and the color separation layer 2911 are arranged in parallel.

The reflective layer 2921 reflects the blue light BLp incident in the −Y direction from the dichroic prism 291 in the + Z direction. The blue light BLp1 reflected by the reflection layer 2921 is emitted from the reflection prism 292 in the + Z direction. In addition, instead of the reflection prism 292, a reflection mirror having a reflection layer 2921 may be adopted.

[Structure of 4th phase difference element]
The fourth phase difference element 30 is arranged in the + Z direction with respect to the dichroic prism 291. In other words, the fourth phase difference element 30 is arranged on the optical path of the green light GLs emitted from the dichroic prism 291. The fourth retardation element 30 is composed of a 1/2 wave plate with respect to the green wavelength band of the incident green light GLs. The fourth phase difference element 30 converts the green light GLs incident from the dichroic prism 291 into the green light GLp1 of the P polarization component. The green light GLp1 converted into the P polarization component by the fourth retardation element 30 is emitted from the light source device 2 in the + Z direction and is incident on the homogenizing device 4 shown in FIG. The fourth phase difference element 30 may be provided in contact with the surface of the dichroic prism 291 from which green light GLs are emitted.

The green light GLp1 is spatially separated from the blue light BLp, is emitted from an emission position different from the emission position of the blue light BLp in the light source device 2, and is incident on the homogenizing device 4. More specifically, the green light GLp1 is emitted from an emission position distant from the emission position of the blue light BLp in the light source device 2 in the + Y direction, and is incident on the homogenizing device 4.

[Structure of second color separation element]
FIG. 8 is a side view of the light source device 2 as seen from the + X direction. In other words, FIG. 8 shows the fifth phase difference element 32 and the second color separation element 33 as viewed from the + X direction. In FIG. 8, the second diffuser 36, the third condensing element 35, and the wavelength conversion element 28 are not shown.

As shown in FIG. 8, the second color separating element 33 is arranged in the + Z direction with respect to the second optical member 23. The second color separation element 33 has a dichroic prism 331 and a reflection prism 332. The dichroic prism 331 and the reflection prism 332 are arranged side by side along the Y axis. The second color separation element 33 separates the light emitted from the second optical member 23 in the + Z direction into green light GLp and red light RLs.

The dichroic prism 331 is composed of a prism type color separation element like the dichroic prism 291. A color separation layer 3311 is provided at the interface between the two substrates. The color separation layer 3311 is tilted by 45 ° with respect to the + Y direction and the + Z direction. In other words, the color separation layer 3311 is tilted by 45 ° with respect to the XY plane and the YZ plane. The color separation layer 3311 and the reflection layer 3321 are arranged in parallel.

The color separation layer 3311 functions as a dichroic mirror that reflects the green light component of the incident light and transmits the red light component. Therefore, of the light incident on the dichroic prism 331 from the second optical member 23, the red light RLs pass through the color separation layer 3311 in the + Z direction and are emitted to the outside of the dichroic prism 331.

On the other hand, of the light incident on the dichroic prism 331 from the second optical member 23, the green light GLP is reflected in the −Y direction by the color separation layer 3311. In the case of the present embodiment, the green light GLp is the light of the S polarization component with respect to the color separation layer 3311 of the dichroic prism 331, and the red light RLs is the light of the P polarization component with respect to the color separation layer 3311 of the dichroic prism 331. That is, the color separation layer 3311 of the present embodiment reflects the green light GLp incident as the light of the S polarization component and transmits the red light RLs incident as the light of the P polarization component. In general, the light of the S-polarized component is easily reflected and the light of the P-polarized component is easily transmitted. Therefore, as described above, the color separation layer of the present embodiment is designed to transmit the P-polarized light and reflect the S-polarized light. The film design of 3311 becomes easy.

Instead of the dichroic prism 331, a dichroic mirror having a color separation layer 3311 may be used.

The reflection prism 332 is arranged in the −Y direction with respect to the dichroic prism 331. The reflection prism 332 has the same configuration as the reflection prism 292. That is, the reflection prism 332 has a color separation layer 3311 and a reflection layer 3321 parallel to the reflection layer 2921.

The reflection layer 3321 reflects the green light GLp reflected and incident by the color separation layer 3311 in the + Z direction. The green light GLP reflected by the reflection layer 3321 is emitted to the outside of the reflection prism 332. In addition, instead of the reflection prism 332, a reflection mirror having a reflection layer 3321 may be adopted.

[Structure of 5th phase difference element]
The fifth phase difference element 32 is arranged in the + Z direction with respect to the dichroic prism 331. In other words, the fifth phase difference element 32 is arranged on the optical path of the red light RLs emitted from the dichroic prism 331. The fifth retardation element 32 is composed of a 1/2 wave plate with respect to the red wavelength band of the incident red light RLs. The fifth phase difference element 32 converts the red light RLs incident from the dichroic prism 331 into the red light RLp1 of the P polarization component. The red light RLp1 converted into the P polarization component by the fifth retardation element 32 is emitted from the light source device 2 in the + Z direction and is incident on the homogenizing device 4 shown in FIG. The fifth retardation element 32 may be provided in contact with the surface of the dichroic prism 331 from which the red light RLs are emitted.

The red light RLp1 is spatially separated from the green light GLp, is emitted from an emission position different from the emission position of the green light GLp in the light source device 2, and is incident on the homogenizing device 4. That is, the red light RLp1 is spatially separated from the blue light BLp, the green light GLp1, and the green light GLp, and is emitted from a position different from the blue light BLp, the green light GLp1, and the green light GLp. It is incident on 4. In other words, the red light RLp1 is emitted from an emission position separated from the emission position of the green light GLp in the light source device 2 in the + Y direction and away from the emission position of the green light GLp1 in the + X direction, and is incident on the homogenizing device 4. ..

[Structure of homogenizer]
As shown in FIG. 1, the homogenizing device 4 equalizes the illuminance in the image forming region of the light modulation device 6 to which the light emitted from the light source device 2 is irradiated. The homogenizing device 4 includes a first multi-lens 41, a second multi-lens 42, and a superimposing lens 43.

The first multi-lens 41 has a plurality of lenses 411 arranged in a matrix in a plane orthogonal to the central axis of the light L incident from the light source device 2, that is, the illumination optical axis Ax. The first multi-lens 41 divides the light incident from the light source device 2 by the plurality of lenses 411 into a plurality of partial luminous fluxes.

FIG. 9 is a schematic diagram showing the incident positions of the light of each color in the first multi-lens 41 viewed from the −Z direction.
As shown in FIG. 9, the green light GLp1, the blue light BLp, the red light RLp1 and the green light GLp emitted from the light source device 2 are incident on the first multi-lens 41. The green light GLp1 emitted from the position in the + Y direction in the −X direction in the light source device 2 is incident on the plurality of lenses 411 included in the region A1 in the + Y direction in the −X direction in the first multilens 41. Further, the blue light BLp emitted from the position in the −X direction and the −Y direction in the light source device 2 is incident on the plurality of lenses 411 included in the region A2 in the −X direction and the −Y direction in the first multi-lens 41. The lens.

The red light RLp1 emitted from the position in the + X direction and the + Y direction in the light source device 2 is incident on a plurality of lenses 411 included in the region A3 in the + X direction and the + Y direction in the first multi-lens 41. The green light GLP emitted from the position in the + X direction and the −Y direction in the light source device 2 is incident on the plurality of lenses 411 included in the region A4 in the + X direction and the −Y direction in the first multi-lens 41. Each color light incident on each lens 411 becomes a plurality of partial luminous fluxes and is incident on the lens 421 corresponding to the lens 411 in the second multi-lens 42.
Of the light L emitted from the light source device 2 of the present embodiment, the green light GLp1 corresponds to the fourth light in the range of the patent claim, the blue light BLp corresponds to the fifth light in the range of the patent claim, and the red light corresponds to the red light. RLp1 corresponds to the 6th light in the range of the patent claim, and the green light GLp corresponds to the 7th light in the range of the patent claim.

As shown in FIG. 1, the second multi-lens 42 is arranged in a matrix in a plane orthogonal to the illumination optical axis Ax, and a plurality of lenses 421 corresponding to the plurality of lenses 411 of the first multi-lens 41 are arranged. Have. A plurality of partial luminous fluxes emitted from the lens 411 corresponding to the lens 421 are incident on each lens 421. Each lens 421 causes the incident partial luminous flux to be incident on the superimposed lens 43.

The superimposing lens 43 superimposes a plurality of partial luminous fluxes incident from the second multi-lens 42 in the image forming region of the optical modulation device 6. More specifically, the green light GLp1, the blue light BLp, the red light RLp1 and the green light GLp, each of which is divided into a plurality of partial light beams, are provided by the second multi-lens 42 and the superimposing lens 43 via the field lens 5. It is incident on each of the plurality of microlenses 621 constituting the microlens array 62 described later of the optical modulator 6 at different angles.

[Configuration of optical modulator]
As shown in FIG. 1, the light modulation device 6 modulates the light emitted from the light source device 2. More specifically, the optical modulation device 6 modulates each color light emitted from the light source device 2 and incident via the homogenization device 4 and the field lens 5 according to the image information, and the image light according to the image information. To form. The optical modulator 6 includes one liquid crystal panel 61 and one microlens array 62.

[LCD panel configuration]
FIG. 10 is a schematic view of a part of the optical modulation device 6 viewed from the −Z direction in an enlarged view. In other words, FIG. 10 shows the correspondence between the pixel PX of the liquid crystal panel 61 and the microlens 621 of the microlens array 62.
As shown in FIG. 10, the liquid crystal panel 61 has a plurality of pixels PX arranged in a matrix in a plane orthogonal to the illumination optical axis Ax.

Each pixel PX has a plurality of sub-pixel SXs that modulate colored light of different colors from each other. In this embodiment, each pixel PX has four sub-pixels SX (SX1 to SX4). Specifically, in one pixel PX, the first sub-pixel SX1 is arranged at a position in the + Y direction in the −X direction. The second sub-pixel SX2 is arranged at a position in the −X direction and the −Y direction. The third sub-pixel SX3 is arranged at a position in the + Y direction in the + X direction. The fourth sub-pixel SX4 is arranged at a position in the + X direction and the −Y direction.

[Microlens array configuration]
As shown in FIG. 1, the microlens array 62 is provided in the −Z direction on the light incident side with respect to the liquid crystal panel 61. The microlens array 62 guides the colored light incident on the microlens array 62 to the individual pixels PX. The microlens array 62 has a plurality of microlenses 621 corresponding to a plurality of pixels PX.

As shown in FIG. 10, the plurality of microlenses 621 are arranged in a matrix in a plane orthogonal to the illumination optical axis Ax. In other words, the plurality of microlenses 621 are arranged in a matrix in the plane orthogonal to the central axis of the light incident from the field lens 5. In the present embodiment, one microlens 621 is provided corresponding to two sub-pixels arranged in the + X direction and two sub-pixels arranged in the + Y direction. That is, one microlens 621 is provided corresponding to the four sub-pixels SX1 to SX4 arranged in two rows and two columns in the XY plane.

The green light GLp1, the blue light BLp, the red light RLp1 and the green light GLp superimposed by the homogenizing device 4 are incident on the microlens 621 at different angles. The microlens 621 causes the colored light incident on the microlens 621 to be incident on the sub-pixel SX corresponding to the colored light. Specifically, the microlens 621 has the green light GLp1 incident on the first sub-pixel SX1 and the blue light BLp incident on the second sub-pixel SX2 among the sub-pixel SXs of the corresponding pixel PX, and the third sub. The red light RLp1 is incident on the pixel SX3, and the green light GLp is incident on the fourth sub-pixel SX4. As a result, the color light corresponding to the sub-pixels SX1 to SX4 is incident on each of the sub-pixels SX1 to SX4, and the corresponding color light is modulated by each of the sub-pixels SX1 to SX4. In this way, the image light modulated by the liquid crystal panel 61 is projected onto a projected surface (not shown) by the projection optical device 7.

[Effect of the first embodiment]
In the conventional projector described in Patent Document 1, a lamp is used as a light source. Since the light emitted from the lamp does not have the same polarization direction, in order to use the liquid crystal panel as the optical modulation device, a polarization conversion means for aligning the polarization directions is required. A polarization conversion means including a multi-lens array and a polarization separating element (PBS) array is generally used in a projector. However, in order to reduce the size of the projector, a multi-lens array with a narrow pitch and a PBS array are required, but it is very difficult to create a PBS array with a narrow pitch.

To solve this problem, in the present embodiment, a plurality of colored lights having the same polarization direction, that is, green light GLp1 of the P polarization component, blue light BLp of the P polarization component, red light RLp1 of the P polarization component, and P polarization component. Green light GLp is emitted from the light source device 2. According to this configuration, it is possible to realize a light source device 2 capable of emitting a plurality of colored lights that are spatially separated and have the same polarization direction without using the polarization conversion element having a narrow pitch as described above. As a result, the light source device 2 can be miniaturized, and eventually the projector 1 can be miniaturized.

Further, in the light source device 2 of the present embodiment, a light source having a blue wavelength band and emitting blue light BL containing blue light BLp as a P-polarizing component and blue light BLs as an S-polarizing component and red light RLp. The blue light BLp incident from the light source unit 21 and the light source unit 21 along the + X direction is transmitted in the + X direction, the blue light BLs are reflected in the −Z direction, and the red light incident from the light source unit 21 along the + X direction. The first optical member 22 that transmits light RLp in the + X direction and the blue light BLp that is arranged in the + X direction with respect to the first optical member 22 and is incident along the + X direction from the first optical member 22 in the −Z direction. A second optical member 23 that reflects light and transmits blue light BLp incident along the + X direction from the first optical member 22 in the + X direction, and a second optical member 23 arranged in the −Z direction with respect to the first optical member 22. 1 A diffuser plate 261 that diffuses blue light BLc1 incident from the optical member 22 along the −Z direction and emits the diffused blue light BLc2 in the + Z direction, and is arranged in the −Z direction with respect to the second optical member 23. The wavelength conversion element 28 that wavelength-converts the blue light BLp incident from the second optical member 23 along the −Z direction and emits the green light GL in the + Z direction, and the + X direction with respect to the second optical member 23. A diffuser plate 361 that diffuses the red light RLp incident from the second optical member 23 along the + X direction and emits the red light RLp in the −X direction. In the second optical member 23, green light GL is incident from the wavelength conversion element 28 along the + Z direction, the green light GLp is transmitted in the + Z direction, the green light GLs are reflected in the −X direction, and the first optical member 22 is used. Transmits the blue light BLc2 emitted from the diffuser plate 261 along the + Z direction, reflects the green light GLs incident from the second optical member 23 along the −X direction in the + Z direction, and reflects the second optical member. 23 reflects the red light RLp emitted from the diffuser plate 361 along the −X direction in the + Z direction.

According to the light source device 2 of the present embodiment, the red light RLp1 can be generated by using the red laser light emitted from the light source unit 21. The red light RLp1 thus generated can increase the amount of light of the red component and improve the color gamut due to the red light, as compared with the red light generated by separating the yellow fluorescence. Therefore, according to the light source device 2 of the present embodiment, the color reproducibility of the red component of the projected image can be improved.

Further, in the projector 1 of the present embodiment, since green light is incident on the light modulator 6 on two sub-pixels SX2 and SX3 out of the four sub-pixel SXs, the amount of green light incident on the pixel PX is light. Can be increased. This makes it possible to increase the visibility of the projected image.

Further, in the light source device 2 of the present embodiment, a first phase difference is provided between the first optical member 22 and the diffuser plate 261 and blue light BLs are incident from the first optical member 22 along the −Z direction. The element 24 is further provided.
According to this configuration, since the first retardation element 24 is provided between the first optical member 22 and the first diffusing device 26, the circularly polarized blue light BLc2 emitted from the first diffusing device 26 is emitted. It can be converted into blue light BLp, which is a P-polarized component, and transmitted through the first optical member 22. Thereby, the utilization efficiency of the blue light BLc2 emitted from the first diffusing device 26 can be improved.

Further, in the light source device 2 of the present embodiment, the second optical member 23 is provided between the second optical member 23 and the second diffuser device 36, and the red light RLp is incident from the second optical member 23 along the + X direction. It is configured to further include a phase difference element 34.
According to this configuration, since the second phase difference element 34 is provided between the second optical member 23 and the second diffusing device 36, the circularly polarized red light RLc2 emitted from the second diffusing device 36 is emitted. It can be converted into red light RLs of the P polarization component and reflected by the second optical member 23. Thereby, the utilization efficiency of the red light RLc2 emitted from the second diffusing device 36 can be improved.

Further, in the light source device 2 of the present embodiment, the light source unit 21 is a third phase difference in which light emitted from the blue light emitting element 213, the red light emitting element 214, and the blue light emitting element 213 is incident and emits blue light BL. It is configured to have an element 2191 and. Further, in the case of the present embodiment, the light source unit 21 is configured by a package structure in which the blue light emitting element 213 and the red light emitting element 214 are mounted on the substrate 212.
According to this configuration, since the light source unit 21 includes the third retardation element 2191, the blue light BL containing the blue light BLp of the P polarization component and the blue light BLs of the S polarization component is used in the first optical member 22. It can be reliably incident. Further, according to this configuration, since the blue light emitting element 213 and the red light emitting element 214 can be mounted in one package, the configuration of the light source unit 21 can be miniaturized. Therefore, the light source device 2 itself can be miniaturized.

Further, in the light source device 2 of the present embodiment, the first optical member 22 is arranged in the + Z direction, and the light emitted from the first optical member 22 is separated into green light GLp1 and blue light BLp. The color separation element 29 and the second color separation element 33 which is arranged in the + Z direction with respect to the second optical member 23 and separates the light emitted from the second optical member 23 into red light RLp1 and green light GLp. , Is further provided.
According to this configuration, green light GLp1, blue light BLp, red light RLp1 and green light GLp can be emitted from the light source device 2.

Further, in the case of the present embodiment, since the fourth phase difference element 30 is arranged on the optical path of the green light GLs emitted from the dichroic prism 291, the green light GLs is converted into the blue light BLp1 of the P polarization component. Can be done. As a result, the green light GLp1 and the blue light BLp emitted from the first color separation element 29 can be used as the light of the P polarization component.

Further, in the case of the present embodiment, since the fifth phase difference element 32 is arranged on the optical path of the red light RLs emitted from the dichroic prism 331, the red light RLs are converted into the red light RLp1 of the P polarization component. Can be done. As a result, the red light RLp1 and the green light GLp emitted from the second color separation element 33 can be used as the light of the P polarization component.
Therefore, all of the green light GLp1, the blue light BLp, the red light RLp1 and the green light GLp emitted from the light source device 2 can be aligned with the light of the P polarization component.

Further, in the case of the present embodiment, since the light source device 2 includes the first condensing element 25 that condenses the blue light BLs toward the first diffusing device 26, the blue light emitted from the first retardation element 24 is provided. The light BLc1 can be efficiently focused on the first diffusing device 26 by the first condensing element 25, and the blue light BLc2 emitted from the first diffusing device 26 can be substantially parallelized. As a result, the loss of blue light BLs can be suppressed, and the utilization efficiency of blue light BLs can be improved.

Further, in the case of the present embodiment, since the light source device 2 includes the second condensing element 27 that condenses the red light RLp toward the second diffusing device 36, the red light emitted from the second optical member 23 is provided. The RLp can be efficiently focused on the second diffuser 36 by the second condenser element 27, and the red light RLc2 emitted from the second diffuser 36 can be substantially parallelized. As a result, the loss of red light RLs can be suppressed, and the utilization efficiency of red light RLs can be improved.

Further, in the case of the present embodiment, since the light source device 2 includes the third condensing element 35 that condenses the blue light BLp toward the wavelength conversion element 28, the blue light BLp emitted from the second optical member 23 is provided. Can be efficiently focused on the wavelength conversion element 28 by the third light source element 35, and the green light GL emitted from the wavelength conversion element 28 can be parallelized. As a result, the loss of blue light BLp and green light GL can be suppressed, and the utilization efficiency of blue light BLp and green light GL can be improved.

As described above, the blue light BLc2 emitted from the first diffusing device 26 is substantially parallelized by the first condensing element 25, but some of the components are incident on the first optical member 22 in a divergent state. Further, the red light RLc2 emitted from the second diffusing device 36 is substantially parallelized by the second condensing element 27, but some of the components are incident on the second optical member 23 in a divergent state. Similarly, the green light GL emitted from the wavelength conversion element 28 is substantially parallelized by the third condensing element 35, but some of the components are incident on the second optical member 23 in a divergent state.

On the other hand, in the light source device 2 of the present embodiment, the first optical member 22 and the second optical member 23 are provided with the first mirror 141 arranged in the + Y direction facing the first mirror 141. A second mirror 142, which is arranged in the −Y direction with respect to the first optical member 22 and the second optical member 23, is further provided.

According to the light source device 2 of the present embodiment, since the mirror unit 40 that sandwiches the first optical member 22 and the second optical member 23 in the Y direction is provided, the light spread in the Y direction is transmitted to the first mirror 141 and the second mirror 142. It can be taken into the first optical member 22 or the second optical member 23 by being reflected by.
As a result, the light emitted from the first diffusing device 26, the second diffusing device 36, and the wavelength conversion element 28 can be efficiently taken into the plate-type first optical member 22 and the second optical member 23.

Further, in the case of the present embodiment, since the projector 1 includes a homogenizing device 4 located between the light source device 2 and the light modulation device 6, blue light BLs and green light GLs emitted from the light source device 2 are used. The light modulator 6 can be illuminated substantially uniformly by the green light GLs and the red light RLs. This makes it possible to suppress color unevenness and luminance unevenness of the projected image.

Further, in the case of the present embodiment, since the optical modulator 6 includes a microlens array 62 having a plurality of microlenses 621 corresponding to the plurality of pixels PX, the four colored lights incident on the optical modulator 6 are transmitted. The microlens 621 can be incident on the corresponding four sub-pixels SX of the liquid crystal panel 61. As a result, each color light emitted from the light source device 2 can be efficiently incident on each sub-pixel SX, and the utilization efficiency of each color light can be improved.

[Second Embodiment]
Hereinafter, the second embodiment of the present invention will be described with reference to FIGS. 11 to 14.
The basic configuration of the light source device of the second embodiment is the same as that of the first embodiment, and the layout of the first diffusing device 26 and the second diffusing device 36 is different from that of the first embodiment. Therefore, the entire description of the light source device will be omitted.
FIG. 11 is a plan view of a main part of the light source device of the second embodiment as viewed from the + Y direction.
In FIG. 11, components common to the drawings used in the first embodiment are designated by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 11, the light source device 20 of the present embodiment includes a light source unit 21, a first optical member 122, a second optical member 123, a first retardation element 24, and a first condensing element 25. , The first diffuser 26, the second retardation element 34, the second light source element 27, the second diffuser 36, the first color separation element 129, the second color separation element 133, and the fourth place. It has a phase difference element 30, a fifth phase difference element 32, a third light source element 35, a wavelength conversion element 28, and a mirror unit 40.

The light source unit 21 of the present embodiment emits blue light BL and red light RLs from the light source 211. In the light source 211 of the present embodiment, a plurality of red light emitting elements 214 are mounted along the Y axis so that the longitudinal direction of the light emitting surface 214a coincides with the Z direction. That is, in the light source 211 of the present embodiment, the red light emitting element 214 of the first embodiment is arranged in a state of being rotated by 90 ° about the emission optical axis of the red light emitting element 214. In this case, the beam shape of the red light ray R emitted from each red light emitting element 214 is an elliptical shape having a long axis in the Y direction. That is, the light source 211 of the present embodiment mounts the red light emitting element 214 so as to emit the light of the S polarization component as the red light ray R. Therefore, the light source 211 of the present embodiment emits red light RLs having an S-polarized component composed of red light rays R emitted from a plurality of red light emitting elements 214.

Since the light source unit 21 of the present embodiment can arbitrarily set the light amount ratio of S-polarization and P-polarization in the blue light BL by the mobile phase difference device 219, each blue light emitting element 213 has an S-polarization component or a P-polarization component. It may be arranged so as to eject any of the above.

The light source device 20 of the present embodiment determines the positional relationship between the first diffusing device 26 and the second diffusing device 36 with respect to the first optical member 122 and the second optical member 123, and the first optical member 22 in the light source device 2 of the first embodiment. And the positional relationship between the first diffusing device 26 and the second diffusing device 36 with respect to the second optical member 23 is replaced. That is, in the light source device 20 of the present embodiment, the first diffusion device 26 is arranged in the + X direction of the second optical member 123, and the second diffusion device 36 is arranged in the −Z direction of the first optical member 122.

The first optical member 122 of the present embodiment includes a first transparent substrate 320, a first optical layer 321 and a second optical layer 322. The first optical layer 321 is formed on the first surface 320a of the first transparent substrate 320. The first optical layer 321 is arranged to face the light source unit 21 and is inclined by 45 ° with respect to the XY plane and the YZ plane.

The first optical layer 321 of the present embodiment has a property of transmitting blue light BL regardless of the polarization direction. Therefore, the first optical layer 321 transmits the blue light BLp of the P-polarized component and the blue light BLs of the S-polarized component contained in the blue light BL incident along the + X direction along the + X direction. Further, the first optical layer 321 has a polarization separation characteristic of transmitting the P polarization component for light in the red wavelength band and reflecting the S polarization component. Therefore, the first optical layer 321 reflects the red light RLs of the S polarization component incident along the + X direction in the −Z direction. The first optical layer 321 is composed of, for example, a dielectric multilayer film.

The second optical layer 322 is formed on the second surface 320b of the first transparent substrate 320. The second optical layer 322 is composed of a dichroic mirror having optical characteristics of transmitting light in the blue wavelength band and red wavelength band and reflecting light in the green wavelength band. Since the second optical layer 322 is composed of a dichroic mirror, the second optical layer 322 can be separated accurately by reflecting or transmitting incident light without using polarization.
The blue light BL transmitted through the first optical layer 321 is transmitted through the first transparent substrate 220 and the second optical layer 322 and emitted in the + X direction.

According to the first optical member 122 having the above configuration, the blue light BL incident from the light source unit 21 along the + X direction is transmitted in the + X direction, and the S polarization component incident from the light source unit 21 along the + X direction. It is possible to reflect red light RLs in the −Z direction.

Since the first optical member 122 of the present embodiment is a plate-type polarization separating element, the function of the first optical layer 321 and the function of the second optical layer 322 can be designed separately. Therefore, the first optical layer 321 and the first optical layer 321 and the second optical layer 322 can be designed separately. The film design of the second optical layer 322 is relatively easy.

The second optical member 123 is arranged in the + X direction with respect to the first optical member 122. Blue light BL transmitted through the first optical member 122 is incident on the second optical member 123. Like the first optical member 22, the second optical member 123 is composed of a plate-type polarization separating element.

The second optical member 123 includes a second transparent substrate 330, a third optical layer 333, and a fourth optical layer 334. The third surface 330a of the second transparent substrate 330 and the second surface 320b of the first transparent substrate 320 face each other. The third optical layer 333 is formed on the third surface 330a of the second transparent substrate 330. The third optical layer 333 is arranged to face the second optical layer 322 and is inclined by 45 ° with respect to the XY plane and the YZ plane.

The third optical layer 333 has a polarization separation characteristic that transmits the P-polarized component and reflects the S-polarized component with respect to the blue light BL. As a result, the third optical layer 333 transmits the blue light BLp of the P polarization component along the + X direction among the blue light BL incident along the + X direction, and transmits the blue light BLs of the S polarization component to −Z. Reflect in the direction. Further, the third optical layer 333 has a polarization separation characteristic of transmitting the P polarization component to light in the green wavelength band and reflecting the S polarization component. The third optical layer 333 is composed of, for example, a dielectric multilayer film.

The fourth optical layer 334 is formed on the fourth surface 330b of the second transparent substrate 330. The fourth optical layer 334 has an optical property of transmitting light of at least the P polarization component of the light in the green wavelength band. Further, the fourth optical layer 334 has a polarization separation characteristic of transmitting a P-polarizing component to light in the blue wavelength band and reflecting the S-polarizing component. The fourth optical layer 334 is composed of, for example, a dielectric multilayer film. When a film having an optical characteristic of reflecting the light of the S polarization component of the light in the blue wavelength band is used as the third optical layer 333, the fourth optical layer 334 can be formed of a simple AR-coated film.

According to the second optical member 123 having the above configuration, the blue light BLp of the P polarization component is transmitted in the + X direction with respect to the blue light BL incident from the first optical member 122 along the + X direction, and the S polarization component is transmitted. It is possible to reflect the blue light BLs in the −Z direction.

Since the second optical member 123 of the present embodiment is a plate-type polarization separating element, the functions of the third optical layer 333 and the fourth optical layer 334 can be separated and designed, so that the third optical layer 333 and the fourth optical layer can be designed separately. The film design of layer 334 is relatively easy.

The first retardation element 24 is arranged in the + X direction with respect to the second optical member 123. That is, the first retardation element 24 is arranged between the second optical member 23 and the first diffusion device 26 on the X-axis. Blue light BLp, which is a P-polarizing component, is incident on the first retardation element 24 from the second optical member 23 along the + X direction. The first light collecting element 25 is arranged in the −X direction with respect to the first retardation element 24.

In the present embodiment, the blue light BLp of the P polarization component transmitted through the second optical member 123 in the + X direction is converted into, for example, counterclockwise circularly polarized blue light BLc1 by the first retardation element 24, and then the first It is incident on the diffuser plate 261 of the first diffuser 26 by the light collector element 25. The counterclockwise circularly polarized blue light BLc1 incident on the diffuser plate 261 is converted into the clockwise circularly polarized blue light BLc2 by being reflected by the diffuser plate 261. The blue light BLc2 emitted from the first diffusing device 26 re-enters the first phase difference element 24 via the first light collecting element 25, and the blue light BLs of the S polarization component are caused by the first phase difference element 24. Is converted to. The converted blue light BLs are incident on the second optical member 123. The blue light BLs are reflected in the + Z direction by the fourth optical layer 334 of the second optical member 123. The blue light BLs converted in this way are emitted from the second optical member 123 in the + Z direction.

The second phase difference element 34 is arranged in the + X direction with respect to the second optical member 123. That is, the second phase difference element 34 is arranged between the first optical member 122 and the second diffusion device 36 on the Z axis. Red light RLs of the S polarization component is incident on the second phase difference element 34 from the first optical member 122 along the −Z direction. The second light collecting element 27 is arranged in the −Z direction with respect to the second retardation element 34.

In the present embodiment, the red light RLs of the S polarization component reflected by the first optical member 122 in the −Z direction are converted into, for example, clockwise circularly polarized red light RLc1 by the second retardation element 34. It is incident on the diffuser plate 361 of the second diffuser 36 by the second light collector element 27. The clockwise circularly polarized red light RLc1 incident on the diffuser plate 361 is converted into the counterclockwise circularly polarized red light RLc2 by being reflected by the diffuser plate 361. The red light RLc2 emitted from the second diffuser 36 re-enters the second phase difference element 34 via the second condensing element 27, and the second phase difference element 34 causes the red light RLp of the P polarization component. Is converted to. The converted red light RLp is incident on the first optical member 122. The red light RLp converted in this way is emitted from the first optical member 122 in the + Z direction.

In the present embodiment, the green light GL emitted from the wavelength conversion element 28 is separated into the green light GLp of the P polarization component and the green light GLs of the S polarization component in the second optical member 123 as in the first embodiment. .. Then, the green light GLs of the S polarization component is emitted from the first optical member 122 in the + Z direction, and the green light GLp of the P polarization component is emitted from the second optical member 123 in the + Z direction.

FIG. 12 is a side view of the light source device 20 as seen from the −X direction. That is, FIG. 12 shows a state in which the first color separating element 129, the fourth retardation element 30, and the like are viewed from the −X direction. In FIG. 12, in order to make the drawings easier to see, the second phase difference element 34, the second light collecting element 27, the second diffusing device 36, and the like are not shown.

As shown in FIG. 12, the first color separating element 129 is arranged in the + Z direction with respect to the first optical member 122. The first color separation element 129 includes a dichroic prism 291 and a reflection prism 292. The first color separation element 129 separates the light emitted from the first optical member 122 in the + Z direction into green light GLs and red light RLp.

Light including green light GLs and red light RLp emitted from the first optical member 122 is incident on the dichroic prism 291. The dichroic prism 291 includes a color separation layer 2912. The color separation layer 2912 functions as a dichroic mirror that reflects the red light component of the incident light and transmits the green light component. Therefore, of the light incident on the dichroic prism 291 from the first optical member 122, the green light GLs pass through the color separation layer 2911 in the + Z direction and are emitted to the outside of the dichroic prism 291. It is reflected in the −Y direction by the separation layer 2912.

In the case of the present embodiment, the red light RLp is the light of the S polarization component with respect to the color separation layer 2912, and the green light GLs is the light of the P polarization component with respect to the color separation layer 2912. That is, the color separation layer 2912 of the present embodiment may be designed so as to reflect the red light RLp incident as the light of the S polarization component and transmit the green light GLs incident as the light of the P polarization component. The film design of the separation layer 2912 is easy.

The red light RLp reflected by the color separation layer 2912 is reflected in the + Z direction by the reflection layer 2922 of the reflection prism 292. The red light RLp reflected by the reflection layer 2922 is emitted from the reflection prism 292 in the + Z direction.

The green light GLs emitted from the dichroic prism 291 are incident on the fourth retardation element 30. The fourth retardation element 30 of the present embodiment converts the green light GLs into the green light GLp1 of the P polarization component. The green light GLp1 converted into the P polarization component by the fourth retardation element 30 is emitted from the light source device 2 in the + Z direction and is incident on the homogenizing device 4 shown in FIG.

The green light GLp1 is emitted from an emission position distant from the emission position of the red light RLp in the light source device 2 in the + Y direction, and is incident on the homogenizing device 4.

FIG. 13 is a side view of the light source device 20 as seen from the + X direction. FIG. 14 is a schematic diagram showing the incident position of each color light on the multi-lens. In other words, FIG. 13 shows the fifth phase difference element 32 and the second color separation element 133 as viewed from the + X direction. In FIG. 13, the first diffusion device 26, the third light collecting element 35, and the wavelength conversion element 28 are not shown.

As shown in FIG. 13, the second color separating element 133 is arranged in the + Z direction with respect to the second optical member 123. The second color separation element 133 has a dichroic prism 331 and a reflection prism 332. The second color separation element 133 separates the light emitted from the second optical member 123 in the + Z direction into blue light BLs and green light GLp.

The dichroic prism 331 has the same configuration as the dichroic prism 291 and includes a color separation layer 3312. The color separation layer 3312 functions as a dichroic mirror that reflects the green light component of the incident light and transmits the blue light component. Therefore, of the light incident on the dichroic prism 331 from the second optical member 123, the blue light BLs pass through the color separation layer 3312 in the + Z direction and are emitted to the outside of the dichroic prism 331, and the green light GLp is the color. It is reflected in the −Y direction by the separation layer 3312.

In the case of the present embodiment, the green light GLp is the light of the S polarization component with respect to the color separation layer 3312, and the blue light BLs is the light of the P polarization component with respect to the color separation layer 3312. That is, the color separation layer 3312 of the present embodiment may be designed so as to reflect the green light GLp incident as the light of the S polarization component and transmit the blue light BLs incident as the light of the P polarization component. The film design of the separation layer 3312 is easy.

The green light GLP reflected by the color separation layer 3312 is reflected in the + Z direction by the reflection layer 3322 of the reflection prism 332. The green light GLP reflected by the reflection layer 3322 is emitted from the reflection prism 332 in the + Z direction.

The blue light BLs emitted from the dichroic prism 331 are incident on the fifth retardation element 32. The fifth retardation element 32 of the present embodiment converts the blue light BLs into the blue light BLp1 of the P polarization component. The blue light BLp1 converted into the P polarization component by the fifth retardation element 32 is emitted from the light source device 2 in the + Z direction and is incident on the homogenizing device 4 shown in FIG.

The blue light BLp1 is emitted from an emission position distant from the emission position of the green light GLp in the light source device 20 in the + Y direction, and is incident on the homogenizing device 4.

As shown in FIG. 14, the light source device 20 of the present embodiment emits green light GLp1, red light RLp1, blue light BLp1, and green light GLp. The green light GLp1 is incident on a plurality of lenses 411 arranged in the region A1 in the −X direction and the + Y direction in the first multilens 41. The red light RLp1 is incident on a plurality of lenses 411 arranged in the region A2 in the −X direction and the −Y direction in the first multilens 41. The blue light BLp1 is incident on a plurality of lenses 411 arranged in the region A3 in the + X direction and the + Y direction in the first multi-lens 41. The green light GLP is incident on a plurality of lenses 411 arranged in the region A4 in the + X direction and the −Y direction in the first multi-lens 41. Each color light incident on each lens 411 becomes a plurality of partial luminous fluxes and is incident on the lens 421 corresponding to the lens 411 in the second multi-lens 42.
Of the light L emitted from the light source device 20 of the present embodiment, the green light GLp1 corresponds to the fourth light in the range of the patent claim, the red light RLp1 corresponds to the fifth light in the range of the patent claim, and the blue light corresponds to the blue light. BLp1 corresponds to the 6th light in the range of the patent claim, and the green light GLp corresponds to the 7th light in the range of the patent claim.

[Effect of the second embodiment]
In the light source device 20 of the present embodiment, the light source unit 21 which has a blue wavelength band and emits blue light BL containing blue light BLp as a P-polarizing component and blue light BLs as an S-polarizing component and red light RLs. A first optical member that transmits blue light BL incident along the + X direction from the light source unit 21 in the + X direction and reflects red light RLs incident along the + X direction from the light source unit 21 in the −Z direction. The blue light BLp arranged in the + X direction with respect to the 122 and the first optical member 122 and incident along the + X direction from the first optical member 122 is transmitted in the + X direction, and the blue light BLs are reflected in the −Z direction. The blue light BLc1 arranged in the + X direction with respect to the second optical member 123 and the second optical member 123 and incident along the + X direction from the second optical member 123 is diffused, and the diffused blue light BLc2 is-. The diffuser plate 261 that emits light in the X direction and the blue light BLp that is arranged in the −Z direction with respect to the second optical member 123 and is incident along the −Z direction from the second optical member 123 are wavelength-converted to produce green light. The wavelength conversion element 28 that emits GL in the + Z direction and the red light RLc1 that is arranged in the −Z direction with respect to the first optical member 122 and is incident along the −Z direction from the first optical member 122 are diffused. A diffuser plate 361 that ejects light in the + Z direction is provided. In the second optical member 123, green light GL is incident from the wavelength conversion element 28 along the + Z direction, the green light GLp is transmitted in the + Z direction, the green light GLs are reflected in the −X direction, and the first optical member 122 Transmits the red light RLc2 emitted from the diffuser plate 361 along the + Z direction, reflects the green light GLs incident from the second optical member 123 along the −X direction in the + Z direction, and is the second optical member. 23 reflects the blue light BLs emitted from the diffuser plate 261 along the −X direction in the + Z direction.

Also in this embodiment, it is possible to realize a light source device 20 capable of emitting a plurality of colored lights having the same polarization direction without using a polarization conversion element having a narrow pitch, and it is possible to reduce the size of the light source device 20 and the projector 1. The same effect as that of the first embodiment can be obtained.

The technical scope of the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the first optical layer and the second optical layer are provided on two surfaces of one translucent substrate. Instead of this configuration, the first optical layer and the second optical layer may be provided on different translucent substrates. For example, the first optical layer is provided on the first surface of the first translucent substrate, the antireflection layer is provided on the second surface different from the first surface of the first translucent substrate, and the first optical layer is the first surface. 2 An antireflection layer is provided on the third surface of the translucent substrate, and is provided on a fourth surface different from the third surface of the second translucent substrate, and the first optical layer and the second optical layer face each other. It may be arranged. Similarly, the third optical layer and the fourth optical layer may be provided on different translucent substrates.

The light source devices 2 and 20 of the above embodiment include a first light collecting element 25, a second light collecting element 27, and a third light collecting element 35. However, the present invention is not limited to this configuration, and at least one of the first condensing element 25, the second condensing element 27, and the third condensing element 35 may not be provided.

In each of the above embodiments, an example is used in which a multi-emitter package structure in which a blue light emitting element 213 that emits a blue light ray B and a red light emitting element 214 that emits a red light ray R are mounted in the same package is used as the light source unit 21. However, the light source unit 21 may be configured to independently include a first light source including a blue light emitting element 213 and a second light source including a red light emitting element 214.

In the above embodiment, as an example, the mobile phase difference device 219 of the light source unit 21 controls the polarization state of the blue light BL1 by adjusting the amount of movement in the Z direction in the third phase difference element 2191. However, a mobile phase difference device having a configuration in which a disk-shaped third phase difference element is rotated on the optical path of the blue light BLs emitted from the light source 211 may be adopted.

In each of the above embodiments, the projector includes a homogenizing device 4 having a first multilens 41, a second multilens 42, and a superimposing lens 43. Instead of this configuration, a homogenizing device having another configuration may be provided, or the homogenizing device 4 may not be provided.

The light source devices 2 and 20 of the above embodiment emit colored light from each of the four emission positions, and the liquid crystal panel 61 constituting the light modulation device 6 has four sub-pixels SX in one pixel PX. .. Instead of this configuration, the light source device may emit three colored lights, and the liquid crystal panel may have a configuration in which one pixel has three sub-pixels. In this case, for example, in the light source device of the above embodiment, the total reflection member may be provided in the optical path of the green light GLs.

The light source devices 2 and 20 of the above-described embodiment are P-polarized and emit spatially separated green light GLp1, blue light BLp, red light RLp1 and green light GLp, respectively. Instead of these configurations, the polarization state of each color light emitted by the light source device may be another polarization state. For example, the light source device may be configured to emit a plurality of spatially separated colored lights, each of which is S-polarized.

In addition, the specific description of the shape, number, arrangement, material, etc. of the light source device and each component of the projector is not limited to the above embodiment, and can be appropriately changed. Further, in the above embodiment, an example in which the light source device according to the present invention is mounted on the projector is shown, but the present invention is not limited to this. The light source device of one embodiment of the present invention can also be applied to lighting equipment, headlights of automobiles, and the like.

The light source device of one aspect of the present invention may have the following configuration.
The light source device of one aspect of the present invention has a first wavelength band and includes a first light polarized in a first polarization direction and a second light polarized in a second polarization direction different from the first polarization direction. , A light source unit that emits a second light having a second wavelength band different from the first wavelength band, and a first light that is polarized in the first polarization direction incident along the first direction from the light source unit. The first light transmitted in one direction and polarized in the second polarization direction is reflected in the second direction intersecting the first direction, and the second light incident from the light source unit along the first direction is directed in the first direction. The transmitted first polarization separation element and the first light arranged in the first direction with respect to the first polarization separation element and polarized in the first polarization direction incident along the first direction from the first polarization separation element. A second polarization separation element that reflects in the second direction and transmits the second light incident along the first direction from the first polarization separation element in the first direction, and a second direction with respect to the first polarization separation element. The first diffusion is arranged in, diffuses the first light incident along the second direction from the first polarization separation element, and emits the diffused first light in the third direction opposite to the second direction. The element and the first light, which is arranged in the second direction with respect to the second polarization separation element and is incident along the second direction from the second polarization separation element, is wavelength-converted to perform the first wavelength band and the second wavelength band. A wavelength conversion element that emits a third light having a third wavelength band different from that in the third direction, and a wavelength conversion element that is arranged in the first direction with respect to the second polarization separation element and along the first direction from the second polarization separation element. The second polarization separation element comprises a second diffusion element that diffuses the incident second light and emits the diffused second light in the fourth direction opposite to the first direction, and the second polarization separation element converts the wavelength. A third light is incident from the element along the third direction, the third light polarized in the first polarization direction is transmitted in the third direction, and the third light polarized in the second polarization direction is reflected in the fourth direction. The first polarization separation element transmits the first light emitted from the first diffusion element along the third direction in the third direction, and is incident from the second polarization separation element along the fourth direction. The third light polarized in the polarization direction is reflected in the third direction, and the second polarization separating element reflects the second light emitted from the second diffusion element along the fourth direction in the third direction.

In the light source device of one aspect of the present invention, the first light provided between the first polarization separation element and the first diffusion element and polarized in the second polarization direction from the first polarization separation element along the second direction. It may be configured to further include a first retardation element to which the light source is incident.

In the light source device of one aspect of the present invention, the second position is provided between the second polarization separation element and the second diffusion element, and the second light is incident from the second polarization separation element along the first direction. It may be configured to further include a phase difference element.

In the light source device of one aspect of the present invention, the first polarization separation element and the second polarization separation element are arranged in the fifth direction intersecting the first direction, the second direction, the third direction, and the fourth direction, respectively. The first mirror is provided facing the first mirror, and is arranged in the sixth direction opposite to the fifth direction with respect to the first polarization separation element and the second polarization separation element. A second mirror may be further provided.

In the light source device of one aspect of the present invention, the light source unit is composed of a first light emitting element that emits light in the first wavelength band, a second light emitting element that emits light in the second wavelength band, and a first light emitting element. The configuration may include a third phase difference element in which the emitted light is incident and emits the first light.

In the light source device of one aspect of the present invention, the light source unit may have a substrate, the first light emitting element may be mounted on the substrate, and the second light emitting element may be mounted on the substrate.

In the light source device of one aspect of the present invention, the light emitted from the first polarization separation element, which is arranged in the third direction with respect to the first polarization separation element, is combined with the fourth light having the third wavelength band. The first color separation element that separates into the fifth light having one wavelength band, and the light that is arranged in the third direction with respect to the second polarization separation element and emitted from the second polarization separation element is the second wavelength. The configuration may further include a second color separating element that separates the sixth light having a band and the seventh light having a third wavelength band.

The light source device of another aspect of the present invention has a first wavelength band and includes a first light polarized in a first polarization direction and a second light polarized in a second polarization direction different from the first polarization direction. , A light source unit that emits a second light having a second wavelength band different from the first wavelength band, and a light source that transmits the first light incident along the first direction from the light source unit in the first direction. A first polarization separation element that reflects the second light incident along the first direction from the unit in the second direction intersecting the first direction, and a first polarization separation element arranged in the first direction with respect to the first polarization separation element. 1 The first light incident from the polarization separation element along the first direction and polarized in the first polarization direction is transmitted in the first direction, and the first light polarized in the second polarization direction is reflected in the second direction. The two polarization separation elements and the first light, which is arranged in the second direction with respect to the second polarization separation element and is polarized in the second polarization direction incident along the second direction from the second polarization separation element, is wavelength-converted. For a wavelength conversion element that emits third light having a third wavelength band different from the first wavelength band and the second wavelength band in the third direction opposite to the second direction, and a second polarization separation element. It is arranged in the first direction, diffuses the first light incident along the first direction from the second polarization separation element, and emits the diffused first light in the fourth direction opposite to the first direction. The first diffuser element and the second light that is arranged in the second direction with respect to the first polarization separation element and is incident along the second direction from the first polarization separation element are diffused, and the diffused second light is emitted. The second polarization separation element includes a second diffusion element that emits light in the third direction, and the second polarization separation element receives third light from the wavelength conversion element along the third direction and polarizes the third light in the first polarization direction. The third light transmitted in the third direction and polarized in the second polarization direction is reflected in the fourth direction, and the first polarization separating element emits the second light emitted from the second diffusion element along the third direction. The third light transmitted in the third direction and polarized in the second polarization direction incident from the second polarization separation element along the fourth direction is reflected in the third direction, and the second polarization separation element is the first diffusion. The first light emitted from the element along the fourth direction is reflected in the third direction.

In the light source device of one aspect of the present invention, the first light provided between the second polarization separation element and the first diffusion element and polarized in the first polarization direction from the first polarization separation element along the first direction. It may be configured to further include a first retardation element to which the light source is incident.

In the light source device of one aspect of the present invention, the second position is provided between the first polarization separation element and the second diffusion element, and the second light is incident from the first polarization separation element along the second direction. It may be configured to further include a phase difference element.

In the light source device of one aspect of the present invention, the first polarization separation element and the second polarization separation element are arranged in the fifth direction intersecting the first direction, the second direction, the third direction, and the fourth direction, respectively. The first mirror is provided facing the first mirror, and is arranged in the sixth direction opposite to the fifth direction with respect to the first polarization separation element and the second polarization separation element. A second mirror may be further provided.

In the light source device of one aspect of the present invention, the light source unit is composed of a first light emitting element that emits light in the first wavelength band, a second light emitting element that emits light in the second wavelength band, and a first light emitting element. The configuration may include a third phase difference element in which the emitted light is incident and emits the first light.

In the light source device of one aspect of the present invention, the light source unit may have a substrate, the first light emitting element may be mounted on the substrate, and the second light emitting element may be mounted on the substrate.

In the light source device of one aspect of the present invention, the light emitted from the first polarization separation element, which is arranged in the third direction with respect to the first polarization separation element, is combined with the fourth light having the second wavelength band. The first color separation element that separates into the fifth light having three wavelength bands, and the light that is arranged in the third direction with respect to the second polarization separation element and emitted from the second polarization separation element is the first wavelength. The configuration may further include a second color separating element that separates the sixth light having a band and the seventh light having a third wavelength band.

The projector of one aspect of the present invention may have the following configurations.
The projector according to one aspect of the present invention projects the light source device according to one aspect of the present invention, the optical modulator that modulates the light from the light source apparatus according to the image information, and the light modulated by the optical modulator. It is equipped with a projection optical device.

In the projector of one aspect of the present invention, a homogenizing device provided between the light source device and the light modulation device is further provided, and the uniformizing device divides the light incident from the light source device into a plurality of partial luminous flux2. The configuration may include one multi-lens and a superposed lens in which a plurality of partial light sources incident from the two multi-lenses are superimposed on the light modulator.

In the projector according to one aspect of the present invention, the optical modulation device is a microlens having a liquid crystal panel having a plurality of pixels and a plurality of microlenses provided on the light incident side with respect to the liquid crystal panel and having a plurality of microlenses corresponding to the plurality of pixels. With an array, each of the plurality of pixels has a first subpixel, a second subpixel, a third subpixel, and a fourth subpixel, and the microlens has a fourth light as the first subpixel. The fifth light may be incident on the second sub-pixel, the sixth light may be incident on the third sub-pixel, and the seventh light may be incident on the fourth sub-pixel.

1 ... Projector, 2, 20 ... Light source device, 4 ... Uniformization device, 6 ... Light modulation device, 7 ... Projection optical device, 21 ... Light source unit, 24 ... First phase difference element, 28 ... Wavelength conversion element, 29, 129 ... 1st color separation element, 33, 133 ... 2nd color separation element, 34 ... 2nd phase difference element, 41 ... 1st multi-lens, 42 ... 2nd multi-lens, 43 ... superimposition lens, 61 ... liquid crystal panel, 62 ... Microlens array, 141 ... First mirror, 142 ... Second mirror, 213 ... Blue light emitting element (first light emitting element), 214 ... Red light emitting element (second light emitting element), 261 ... Diffusing plate (first diffusion) Element), 361 ... diffuser plate (second diffuser), 2191 ... third phase difference element, SX1 ... first subpixel, SX2 ... second subpixel, SX3 ... third subpixel, SX4 ... fourth subpixel, BL ... blue light (first light), BLp ... blue light (first light polarized in the first polarization direction), BLs ... blue light (first light polarized in the second polarization direction), RLp ... red light (first light) 2 light), GL ... green light (third light), GLp ... green light (third light polarized in the first polarization direction), GLs ... green light (third light polarized in the second polarization direction).

Claims (17)

The first light having a first wavelength band and including light polarized in the first polarization direction and light polarized in a second polarization direction different from the first polarization direction, and a first light different from the first wavelength band. A light source unit that emits second light having two wavelength bands, and
The first light incident from the light source unit along the first direction and polarized in the first polarization direction is transmitted in the first direction, and the first light polarized in the second polarization direction is transmitted through the first direction. A first polarization separating element that reflects in a second direction intersecting the direction and transmits the second light incident from the light source unit along the first direction in the first direction.
The first light, which is arranged in the first direction with respect to the first polarization separation element and is polarized in the first polarization direction incident along the first direction from the first polarization separation element, is the second. A second polarization separating element that reflects in a direction and transmits the second light incident from the first polarization separating element along the first direction in the first direction.
The first light, which is arranged in the second direction with respect to the first polarization separation element and is incident along the second direction from the first polarization separation element, is diffused, and the diffused first light is used as described above. The first diffusion element that emits light in the third direction, which is the opposite direction to the second direction,
The first light, which is arranged in the second direction with respect to the second polarization separation element and is incident along the second direction from the second polarization separation element, is wavelength-converted to perform the first wavelength band and the said. A wavelength conversion element that emits third light having a third wavelength band different from the second wavelength band in the third direction, and
The second light, which is arranged in the first direction with respect to the second polarization separation element and is incident along the first direction from the second polarization separation element, is diffused, and the diffused second light is used as described above. A second diffusion element that ejects light in a fourth direction opposite to the first direction is provided.
In the second polarization separating element, the third light is incident from the wavelength conversion element along the third direction, and the third light polarized in the first polarization direction is transmitted in the third direction, and the third light is transmitted. The third light polarized in the second polarization direction is reflected in the fourth direction to be reflected.
The first polarization separating element transmits the first light emitted from the first diffusion element along the third direction in the third direction, and is transmitted from the second polarization separating element along the fourth direction. The third light, which is polarized in the second polarization direction, is reflected in the third direction.
The second polarization separation element is a light source device that reflects the second light emitted from the second diffusion element along the fourth direction in the third direction. A first light provided between the first polarization separation element and the first diffusion element and polarized in the second polarization direction along the second direction is incident from the first polarization separation element. The light source device according to claim 1, further comprising one retardation element. A claim further comprising a second retardation element provided between the second polarization separation element and the second diffusion element, and the second light is incident from the second polarization separation element along the first direction. The light source device according to claim 1 or 2. A first, which is arranged in a fifth direction intersecting the first direction, the second direction, the third direction, and the fourth direction with respect to the first polarization separation element and the second polarization separation element. With a mirror
A second mirror provided facing the first mirror and arranged in a sixth direction opposite to the fifth direction with respect to the first polarization separation element and the second polarization separation element. The light source device according to any one of claims 1 to 3, further comprising. The light source unit is incident with a first light emitting element that emits light in the first wavelength band, a second light emitting element that emits light in the second wavelength band, and light emitted from the first light emitting element. The light source device according to any one of claims 1 to 4, further comprising a third retardation element that emits the first light. The light source unit has a substrate and has a substrate.
The first light emitting element is mounted on the substrate and is mounted on the substrate.
The light source device according to claim 5, wherein the second light emitting element is mounted on the substrate. The light emitted from the first polarization separation element, which is arranged in the third direction with respect to the first polarization separation element, is the fourth light having the third wavelength band and the first light having the first wavelength band. The first color separation element that separates into 5 lights and
The light emitted from the second polarization separation element, which is arranged in the third direction with respect to the second polarization separation element, is the sixth light having the second wavelength band and the third light having the third wavelength band. 7. The light source device according to any one of claims 1 to 6, further comprising a second color separating element for separating light and a second color separating element. The first light having a first wavelength band and including light polarized in the first polarization direction and light polarized in a second polarization direction different from the first polarization direction, and a first light different from the first wavelength band. A light source unit that emits second light having two wavelength bands, and
The first light incident from the light source unit along the first direction is transmitted in the first direction, and the second light incident from the light source unit along the first direction is referred to as the first direction. A first polarization separating element that reflects in the intersecting second direction,
The first light, which is arranged in the first direction with respect to the first polarization separation element and is polarized in the first polarization direction incident along the first direction from the first polarization separation element, is the first. A second polarization separating element that transmits in the direction and reflects the first light that is polarized in the second polarization direction in the second direction.
The first light, which is arranged in the second direction with respect to the second polarization separation element and is polarized in the second polarization direction incident along the second direction from the second polarization separation element, is wavelength-converted. A wavelength conversion element that emits a third light having a third wavelength band different from the first wavelength band and the second wavelength band in a third direction opposite to the second direction.
The first light, which is arranged in the first direction with respect to the second polarization separation element and is incident along the first direction from the second polarization separation element, is diffused, and the diffused first light is used as described above. The first diffusion element that emits light in the fourth direction, which is the opposite direction to the first direction,
The second light, which is arranged in the second direction with respect to the first polarization separation element and is incident along the second direction from the first polarization separation element, is diffused, and the diffused second light is used as described above. It is equipped with a second diffusion element that emits light in the third direction.
In the second polarization separating element, the third light is incident from the wavelength conversion element along the third direction, and the third light polarized in the first polarization direction is transmitted in the third direction, and the third light is transmitted. The third light polarized in the second polarization direction is reflected in the fourth direction to be reflected.
The first polarization separating element transmits the second light emitted from the second diffusion element along the third direction in the third direction, and is transmitted from the second polarization separating element along the fourth direction. The third light, which is polarized in the second polarization direction, is reflected in the third direction.
The second polarization separation element is a light source device that reflects the first light emitted from the first diffusion element along the fourth direction in the third direction. A first light provided between the second polarization separation element and the first diffusion element and polarized in the first polarization direction along the first direction is incident from the first polarization separation element. The light source device according to claim 8, further comprising one retardation element. A claim further comprising a second retardation element provided between the first polarization separation element and the second diffusion element, and the second light is incident from the first polarization separation element along the second direction. Item 8. The light source device according to claim 9. A first, which is arranged in a fifth direction intersecting the first direction, the second direction, the third direction, and the fourth direction with respect to the first polarization separation element and the second polarization separation element. With a mirror
A second mirror provided facing the first mirror and arranged in a sixth direction opposite to the fifth direction with respect to the first polarization separation element and the second polarization separation element. The light source device according to any one of claims 8 to 10, further comprising. The light source unit is incident with a first light emitting element that emits light in the first wavelength band, a second light emitting element that emits light in the second wavelength band, and light emitted from the first light emitting element. The light source device according to any one of claims 8 to 11, further comprising a third retardation element that emits the first light. The light source unit has a substrate and has a substrate.
The first light emitting element is mounted on the substrate and is mounted on the substrate.
The light source device according to claim 12, wherein the second light emitting element is mounted on the substrate. The light emitted from the first polarization separation element, which is arranged in the third direction with respect to the first polarization separation element, is the fourth light having the second wavelength band and the third light having the third wavelength band. The first color separation element that separates into 5 lights and
The light emitted from the second polarization separation element, which is arranged in the third direction with respect to the second polarization separation element, is the sixth light having the first wavelength band and the third light having the third wavelength band. 7. The light source device according to any one of claims 8 to 13, further comprising a second color separating element for separating light and a second color separating element. The light source device according to claim 7 or 14.
An optical modulation device that modulates the light from the light source device according to the image information, and
A projection optical device that projects light modulated by the light modulation device, and
A projector equipped with. Further, a homogenizing device provided between the light source device and the light modulation device is provided.
The homogenizing device is
Two multi-lenses that divide the light incident from the light source device into a plurality of partial luminous fluxes, and
The projector according to claim 15, further comprising a superimposed lens that superimposes the plurality of partial luminous fluxes incident from the two multi-lenses on the optical modulation device. The optical modulator has a liquid crystal panel having a plurality of pixels and a microlens array provided on the light incident side with respect to the liquid crystal panel and having a plurality of microlenses corresponding to the plurality of pixels.
Each of the plurality of pixels has a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel.
The microlens has the fourth light incident on the first sub-pixel, the fifth light incident on the second sub-pixel, the sixth light incident on the third sub-pixel, and the seventh. The projector according to claim 16, wherein light is incident on the fourth sub-pixel.

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